CHANGELOG.md

Changelog

2.0.0 (in development)

Read the v2 migration guide

• add type annotations to all public and private functions throughout package (#1107)
• remove all functionality previously deprecated in v1 (#1113 #1122 #1135 #1148)
• drop Python 3.8 support (#1106)
• bump minimum required numpy version to 1.21 for typing support (#1133)
• improve docstrings throughout package (#1116)
• improve logging and warnings throughout package (#1125)
• improve error messages throughout package (#1131)
• refactor features module for speed improvement and memory efficiency (#1157)
• refactor save_graph_xml function and _osm_xml module for speed improvement and bug fixes (#1135)
• make save_graph_xml function accept only an unsimplified MultiDiGraph as its input data (#1135)
• replace save_graph_xml function's edge_tag_aggs tuple parameter with way_tag_aggs dict parameter (#1135)
• add OSM junction and railway tags to the default settings.useful_tags_node (#1144)
• add node_attrs_include argument to simplification.simplify_graph function to flexibly relax strictness (#1145)
• add edge_attr_aggs argument to simplify_graph function to specify aggregation behavior (#1155)
• add node_attr_aggs argument to the consolidate_intersections function to specify aggregation behavior (#1155)
• allow per-node tolerance values for intersection consolidation (#1160)
• make consolidate_intersections function retain unique attribute values when consolidating nodes (#1144)
• make which_result function parameters consistently able to accept a list throughout package (#1113)
• handle implicit maxspeed values in add_edge_speeds function (#1153)
• change add_node_elevations_google default batch_size to 512 to match Google's limit (#1115)
• allow analysis of MultiDiGraph directional edge bearings and orientation (#1139)
• fix graph projection creating useless lat and lon node attributes (#1144)
• fix bug in _downloader._save_to_cache function usage (#1107)
• fix bug in handling requests ConnectionError when querying Overpass status endpoint (#1113)
• fix minor bugs throughout to address inconsistencies revealed by type enforcement (#1107 #1114)
• make optional function parameters keyword-only throughout package (#1134)
• make dist function parameters required rather than optional throughout package (#1134)
• make utils_geo.bbox_from_point function return a tuple of floats for consistency with rest of package (#1113)
• rename truncate.truncate_graph_dist max_dist argument to dist for consistency with rest of package (#1134)
• remove retain_all argument from all truncate module functions (#1148)
• remove settings module's deprecated and now replaced settings (#1129 #1136)
• rename osm_xml module to _osm_xml to make it private, as all its functions are private (#1113)
• rename private _downloader module to _http (#1114)
• remove unnecessary private _api module (#1114)

1.9.3 (2024-05-01)

• update the official package reference paper (#1169)
• rename network_types "all" -> "all_public" and "all_private" -> "all" for clarity (#1164)
• deprecate the obsolete "all_private" network_type name (#1164)

1.9.2 (2024-04-02)

• deprecate and replace settings module's default_accept_language, default_referer, and default_user_agent settings (#1138)
• deprecate and replace settings module's memory, nominatim_endpoint, overpass_endpoint, and timeout settings (#1138)
• deprecate save_graph_xml function's renamed or obsolete parameters (#1138)
• deprecate graph_from_xml tags and polygon function parameters (#1146)
• deprecate simplify_graph function's endpoint_attrs argument and replace it with edge_attrs_differ (#1146)
• deprecate utils_graph.get_digraph function and replace it with covert.to_digraph function (#1146)
• deprecate utils_graph.get_undirected function and replace it with covert.to_undirected function (#1146)
• deprecate utils_graph.graph_to_gdfs function and replace it with covert.graph_to_gdfs function (#1146)
• deprecate utils_graph.graph_from_gdfs function and replace it with covert.graph_from_gdfs function (#1146)
• deprecate utils_graph.remove_isolated_nodes function (#1156)
• deprecate utils_graph.get_largest_component function and replace it with truncate.largest_component function (#1146)
• deprecate utils_graph.route_to_gdf function and replace it with routing.route_to_gdf function (#1146)
• deprecate speed module and move all of its functionality to the routing module (#1146)

1.9.1 (2024-02-01)

• fix deprecation warning in simplification.simplify_graph function (#1126)

1.9.0 (2024-01-31)

• add endpoint_attrs argument to simplification.simplify_graph function to flexibly relax strictness (#1117)
• fix a bug in the features module's polygon handling (#1104)
• update obsolete numpy random number generation (#1108)
• make deprecation warnings FutureWarnings (#1124)
• update warning messages to note that deprecated code will be removed in v2.0.0 (#1111)
• deprecate strict argument in simplification.simplify_graph function in favor of new endpoint_attrs argument (#1117)
• deprecate north, south, east, west arguments throughout package in favor of bbox tuple argument (#1112)
• deprecate return_coords argument in graph.graph_from_address function (#1105)
• deprecate return_hex argument in plot.get_colors function (#1109)
• deprecate address, point, network_type, edge_color, and smooth_joints arguments in plot.plot_figure_ground function (#1121)

1.8.1 (2023-12-31)

• fix a bug arising from the save_graph_xml function (#1093)
• warn user if their query area is significantly larger than max query area size (#1101)
• refactor utils_geo module and deprecate quadrat_width and min_num function arguments (#1100)
• under-the-hood code clean-up (#1092 #1099 #1103)

1.8.0 (2023-11-30)

• formally support Python 3.12 (#1082)
• fix Windows-specific character encoding issue when reading XML files (#1084)
• resolve pandas and gdal future warnings (#1089)
• use spawn instead of fork for multiprocessing to resolve Python 3.12 deprecation warning (#1089)
• rename add_node_elevations_google function's max_locations_per_batch parameter, with deprecation warning (#1088)
• move add_node_elevations_google function's url_template parameter to settings module, with deprecation warning (#1088)

1.7.1 (2023-10-29)

• fix references to latitude and longitude parameters as lat and lon consistently across package (#1068 #1069)
• fix handling of dict and set attribute types when reloading GraphML files (#1075 #1077)

1.7.0 (2023-10-11)

• improve automatic UTM handling in the projection module (#1059)
• add a to_latlong parameter to the projection.project_graph function for API consistency (#1057)
• workaround for pytest issue with printing to terminal window on Windows (#1064)
• refactor the distance module and add a new routing module (#1063)
• move shortest_path and k_shortest_paths functions to new routing module, with deprecation warning (#1063)
• rename great_circle_vec and euclidean_dist_vec functions to great_circle and euclidean, with deprecation warning (#1063)
• under-the-hood code clean-up (#1047)

1.6.0 (2023-07-28)

• fix DNS resolution in Dask clusters (#1039)
• improve memory efficiency during features GeoDataFrame creation (#1043)
• handle the settings.cache_only_mode option in the features module (#1043)
• deprecate the buffer_dist and clean_periphery function parameters throughout package (#1044)
• add more descriptive exceptions: ResponseStatusCodeError and GraphSimplificationError (#1041)
• replace CacheOnlyModeInterrupt exception with CacheOnlyInterruptError exception (#1041)
• replace EmptyOverpassResponse exception with InsufficientResponseError exception (#1041)
• refactor elevation module (#1042 #1043)
• refactor the _downloader module and add new _overpass and _nominatim modules (#1043)
• under-the-hood code clean-up (#1036 #1037 #1038)

1.5.1 (2023-07-08)

• improve memory efficiency during graph creation (#1021 #1029)
• improve log messaging (#1032)
• add version number to XML generator attribute in save_graph_xml (#1031)
• warn user if loading a .osm XML file generated by OSMnx itself (#1031)
• add style keyword argument to citation function (#1034)

1.5.0 (2023-06-28)

• fix bug in save_graph_xml due to roundabout ways (#986 #999)
• fix GeoPandas future warning (#1012)
• make API key properly optional in elevation.add_node_elevations_google function (#999)
• rename geometries module as features module and deprecate geometries module (#1007 #1011)
• remove private _polygon_features module and move its data to features module (#994)
• make the internal downloader module private (#1010)
• deprecate interpolate parameter in distance.nearest_edges function (#1010)
• move save_graph_xml function to io module with deprecation warning in osm_xml module (#1017)
• migrate from setup.py, setup.cfg, and requirements.txt to pyproject.toml (#1002)
• pin optional dependencies to minimum required versions (#995)
• expand and reorganize the documentation (#993)

1.4.0 (2023-06-11)

• verify edge weight attribute values before solving shortest paths (#967)
• provide consistent error when no data elements are returned from Overpass (#960)
• add route_to_gdf function to utils_graph module to return a GeoDataFrame of the edges in a path (#957)
• deprecate the get_route_edge_attributes function in favor of the new route_to_gdf function (#957)
• deprecate folium module in favor of using geopandas.GeoDataFrame.explore directly (#957)
• deprecate precision parameter in bearing, distance, elevation, and speed modules' functions (#981)
• deprecate utils_geo.round_geometry_coords function (#981)
• move plot_orientation function from bearing module to plot module (#956)
• make matplotlib an optional dependency required only for the plot module (#976)
• drop pyproj package dependency (#980)

1.3.1.post0 (2023-05-26)

• restore Python 3.8 compatibility (#965)

1.3.1 (2023-05-24)

• improve DNS resolution when using proxies or on networks blocking DNS-over-HTTPS (#924 #953)
• improve processing of per-lane values when adding edge speeds (#944 #955)
• improve file writing in save_graph_xml function (#917 #961)
• ensure node coordinates are non-null and convertible to float in the add_edge_lengths function (#950)
• ignore ways tagged highway=no or highway=razed in built-in filters (#938)
• do not assume an edge with key=0 exists between each node pair when simplifying graph (#921)
• drop dateutil package dependency (#919)

1.3.0 (2023-01-01)

• fully support Shapely 2.0 and drop support for Shapely 1.x (#900)
• drop RTree package dependency (#900)
• much faster nearest edges search using STRTree index (#900)
• allow using alternative Google Maps compatible elevation APIs, such as Open Topo Data (#901 #903)
• optionally track merged_edges as a new edge attribute in simplify_graph function (#892 #909)

1.2.3 (2022-12-14)

• fix bug that added unsimplified edge geometry attributes when projecting
• hard code Google DNS IP address
• resolve matplotlib deprecation warning
• deprecate save_graph_shapefile function

1.2.2 (2022-08-05)

• fix compatibility with rasterio 1.3
• fix API version when saving OSM XML
• resolve shapely deprecation warning

1.2.1 (2022-06-16)

• fix rate limit checking and pausing on newest versions of Overpass API
• allow add_edge_lengths function to be run on a subset of edges
• resolve pandas deprecation warning

1.2.0 (2022-05-23)

• add ability to load GraphML string data to the load_graphml function
• add "reversed" edge attribute to support node-order-dependent edge attributes
• add new edge_color and edge_linewidth arguments to plot_footprints function
• fix nearest_edges function selecting arbitrary edge when bounding boxes overlap
• fix get_digraph function's parallel edge handling
• fix pandas and geopandas version compatibility
• fix log output appearing in Jupyter notebooks on Unix-like systems
• remove old functions and arguments previously deprecated in v1.1
• deprecate utils.config function in favor of using settings module directly

1.1.2 (2021-11-17)

• fix geocoding when no geojson is returned
• fix graph simplification to properly handle travel_time edge attributes
• fix streets per node not being calculated when clean_periphery=False
• allow user-defined aggregation function when imputing missing edge speeds
• allow user to configure requests package keyword arguments when connecting to APIs
• faster graph projection by calculating UTM zone number with a computationally cheaper method
• improve efficiency of quadrat-based geometry cutting
• fall back on google dns resolution when necessary if using a proxy
• move count_streets_per_node function to stats module
• resolve shapely and geopandas deprecation warnings

1.1.1 (2021-05-19)

• fix overpass status endpoint checks with explicit IP address resolution
• fix slot management on local overpass instances by optionally disabling rate limiting
• parallelize shortest_path calculation for multiple origins/destinations

1.1.0 (2021-05-01)

• add graph-constrained spatial sampling function
• add add_node_elevations_raster function to add node elevations from local raster file(s)
• add add_node_elevations_google function and deprecate old add_node_elevations function
• add faster streamlined nearest_nodes and nearest_edges functions to distance module
• deprecate old get_nearest_node, get_nearest_nodes, get_nearest_edge, and get_nearest_edges
• add utils_geo.interpolate_points function and deprecate redistribute_vertices in favor of it
• add vectorized calculate_bearing function and deprecate get_bearing in favor of it
• expose individual street network stats functions in stats module
• deprecate the extended_stats function in stats module
• add network orientation and entropy stats functions to bearing module
• add plot_orientation function to bearing module to polar histograms of graph edge bearings
• add route_linewidths parameter to plot_graph_routes function
• handle relations of type "boundary" in geometries module
• multi-index GeoDataFrames returned from geometries module by element type and osmid
• ensure all nodes have integer IDs after graph intersection consolidation
• vectorize add_edge_lengths, add_edge_grades, and add_edge_bearings functions
• improve save_graph_xml speed
• improve geocoder module error messages
• improve handling of node geometry when converting graph to/from GeoDataFrames
• fix network_type filters allowing ways tagged "bus_guideway"
• fix handling of boolean type conversion in load_graphml
• fix truncate_graph_dist retaining unreachable nodes
• fix bug in consolidate_intersections when pygeos is installed
• move add_edge_lengths function from utils_graph to distance module
• remove descartes dependency in line with geopandas

1.0.1 (2021-01-13)

• fix network_type filters allowing ways tagged "planned"
• fix "drive" network_type allowing some alleys
• fix intersection consolidation for compatibility with v1.0 node ids/indexing
• fix python 3.6 compatibility
• deprecate folium polyline styling arguments

1.0.0 (2021-01-01)

• set use_cache=True by default
• add ability to query a place by OSM ID in geocoder.geocode_to_gdf function
• add optional setting for download/cache-only mode
• replace md5 with sha1 for cache filename hashing
• replace streets_per_node graph attribute with equivalent street_count node attribute
• remove redundant osmid node attribute
• make graph_to_gdfs multi-index the edges GeoDataFrame by u, v, key
• refactor consolidate_intersections function for better speed and efficiency
• refactor count_streets_per_node function for better speed and efficiency
• refactor folium module for better speed and efficiency
• refactor get_undirected functionality for better speed and efficiency
• extract all private/internal .osm XML functionality into new osm_xml module
• deprecate io.save_graph_xml with warning (function moved to osm_xml module)
• remove internal _is_simplified function
• remove deprecated pois module
• remove deprecated footprints module
• remove deprecated utils_graph.induce_subgraph function
• remove deprecated node_type parameter from io.load_graphml function

0.16.2 (2020-11-17)

• improve graph_from_gdfs speed and efficiency
• improve plot_route_folium speed and efficiency
• fix remove_isolated_nodes function mutating the passed-in graph
• fix gephi compatibility in save_graphml
• add customizable node/edge attribute data type arguments to load_graphml
• deprecate old node_type argument in load_graphml
• expose bidirectional_network_types via config function

0.16.1 (2020-10-05)

• fix handling graphs with no intersections in consolidate_intersections
• fix consolidate_intersections returning GeoSeries without CRS attribute
• fix response caching to save only when status code is 200
• fix elevation module's grade absolute value calculation when grade is null
• move shortest path functions from utils_graph module to distance module

0.16.0 (2020-09-07)

• new geometries module for creating GeoDataFrames from tag/value queries
• deprecate old pois and footprints modules (replaced by geometries module)
• auto-select first Polygon/MultiPolygon when geocoding with which_result=None
• new kshortest_paths function to solve _k shortest paths from origin to destination
• new shortest_path convenience function
• new get_digraph function to correctly convert MultiDiGraph to DiGraph
• miscellaneous performance improvements and optimizations
• deprecate induce_subgraph function
• remove deprecated boundaries module (replaced by geocoder module in v0.15.0)
• remove deprecated utils_geo.geocode function (replaced by geocoder.geocode function in v0.15.0)

0.15.1 (2020-07-03)

• fix geopandas future warnings

0.15.0 (2020-06-30)

• improve plotting defaults and streamline plot module speed and efficiency
• improve color handling in plot module
• improve route plotting
• plot_graph_routes function now accepts multiple route colors
• allow multiple elevation API providers
• consolidate_intersections replaces update_edge_lengths param with reconnect_edges param
• fix geopackage file saving after consolidating intersections
• add new geocoder module and move utils_geo.geocode function into it
• replace gdf_from_place/s functions with geocoder.geocode_to_gdf
• deprecate boundaries module
• remove deprecated timeout, memory, custom_settings, and max_query_area_size function params
• remove deprecated plotting params and plot_shape function

0.14.1 (2020-06-09)

• fix simplification of graphs with long rural roads
• reduce memory footprint of graph simplification
• remove disconnected self-contained rings from graph by default when simplifying
• improve speed and efficiency of project_graph, graph_to_gdfs, and graph_from_gdfs
• improve attribute value conversion in load_graphml
• expose precision parameter for adding bearings, elevations, speeds, and travel times
• fix config function clobber behavior
• fix graph periphery cleaning when clean_periphery=True but simplify=False
• rename settings useful_tags_path to the more appropriate useful_tags_way
• deprecate the timeout, memory, custom_settings, and max_query_area_size function params
• the params above are now accessible via config function and settings module
• deprecate old plot params and plot_shape function
• remove previously deprecated infrastructure parameter in favor of custom_filter

0.14.0 (2020-06-03)

• better geometry subdividing for huge OSM queries
• better handling of maxspeed list values for simplified graphs
• downloader only retrieves url response from cache if no server remark
• deprecate graph creation infrastructure parameter in favor of flexible custom_filter
• remove deprecated functions: graph_from_file, clean_intersections, gdfs_to_graph

0.13.0 (2020-05-25)

• major refactor of entire package
• clean up API and namespace
• new consolidate_intersections function with topological option
• new speed module to calculate graph edge speeds and travel times
• generalize POIs module to query with a flexible tags dict
• allow folium functions to accept FeatureGroup and kwargs
• all graph saving functions now take a filepath argument instead of folder/filename
• save shapefiles in single folder containing both nodes and edges
• optionally return distance and/or geometry in nearest edge search
• expose timeout and memory parameters in pois and footprints modules
• define default crs via epsg code instead of proj4 string
• update and simplify logging with timestamps
• graph metadata: add creation date and version, remove name
• replace inconsistent distance parameters with consistent dist parameters
• deprecate old clean_intersections function in favor of new consolidate_intersections
• deprecate old gdfs_to_graph function in favor of graph_from_gdfs
• deprecate old graph_from_file function in favor of graph_from_xml
• rename save_as_osm function -> save_graph_xml for consistency
• rename save_load module -> io
• remove old save_gdf_shapefile function
• drop support for python 3.5 and lower

0.12.1 (2020-05-01)

• fix handling relations with missing type tag
• fix save_graph_geopackage handling numeric attributes
• fix load_graphml handling elevation and grade attributes
• improve edge finding algorithms to return edge key
• more informative graph_from_file data load error message
• refactor url-in-cache checking
• add timestamp helper function
• documentation improvements

0.12 (2020-04-10)

• add ability to save graph as geopackage file
• add truncate_by_edge implementation in truncate_graph_polygon
• allow flexible overpass settings (e.g., to query by date)
• better handling of invalid footprint geometries
• geocode function now uses nominatim_request function
• improve .osm xml output
• improve one-way street handling
• fix graph projection overwriting original lat/lng
• fix redistribute_vertices function for MultiLineStrings

0.11.4 (2020-01-31)

• fix .osm xml output
• fix for pandas 1.0

0.11.3 (2020-01-09)

• fix errant print statement

0.11.2 (2020-01-07)

• fix .osm xml output
• fix geopandas future compatibility

0.11.1 (2020-01-01)

• fix get_nearest_edges search when not using a spatial index

0.11 (2019-12-04)

• drop formal python 2 support
• refactor all modules for cleaner package organization
• make stats betweenness centrality compatible with networkx>=2.4
• allow configurable overpass and nominatim endpoints
• allow gdf_from_places to take a which_result list argument
• handle zero-division in street grade calculation
• better footprint relation handling
• improve network type queries for better filtering
• fix pois_from_polygon returning points outside polygon

0.10 (2019-05-08)

• remove deprecated buildings module
• filter steps ways out of bike queries
• convert CRS-handling to proj4 strings
• save graph to xml-formatted .osm file
• minor refactoring

0.9 (2019-01-28)

• deprecate buildings module and replace with generalized footprints module
• improve handling of multipolygon footprints
• new function to find nearest edge(s), given coordinates
• add "search," "reverse," and "lookup" nominatim queries
• use unprojected graphs for figure-ground plotting functions
• allow non-integer osmid values for custom data
• improve get_route_edge_attributes function
• improve color mapping by node/edge attribute value
• make bidirectional network types explicit
• networkx compatibility fixes to resolve warnings

0.8.2 (2018-09-19)

• add python 3.7 compatibility
• add convenience function to plot several routes over the same map
• optimize graph truncation to bounding box
• give self-loops a null bearing when calculating edge bearings
• make accept-language http header explicit and configurable
• add citation function
• refactor POI module

0.8.1 (2018-05-17)

• add Gephi compatibility argument for saving GraphML
• handle square bracket encapsulated strings when loading GraphML

0.8 (2018-05-05)

• add ability to retrieve points of interest
• improve performance for retrieving huge geographies' street networks
• fix building footprint retrieval query syntax
• minor bug fixes

0.7.4 (2018-04-05)

• add fast nearest-nodes search
• allow custom network query filters
• allow create_graph to return graph with no edges
• improve figure_ground joint smoothing
• fix handling of parallel edges when making multidigraph undirected
• generalize same-geometry checker
• improve detection of prior topology simplification
• custom error types for finer-grained handling

0.7.3 (2018-03-12)

• turn off x- and y-axes to improve plotting appearance
• make floating-point precision and rounding more sensible
• improve OS path handling cross-platform
• replace great-circle distance calculator with haversine
• add access filter as configurable setting
• improve performance of inducing subgraphs
• fix utils.get_largest_component for networkx 2.2 compatibility
• fix config settings namespacing

0.7.2 (2018-02-15)

• compatibility with networkx 2.1

0.7.1 (2018-02-04)

• fix documentation build
• ignore ways marked access=no

0.7 (2018-02-01)

• ability to load a graph from a .osm file
• change datum from NAD83 to WGS84
• make roundabouts one-way
• conformal plotting for unprojected graphs
• fix folium web maps rendering

0.6 (2017-10-02)

• migrate to the networkx 2.0 API

0.5.4 (2017-09-16)

• add optional cleaned intersections count to basic stats
• allow circuity to be calculated for projected or unprojected networks
• various code clean-up and refactoring

0.5.3 (2017-07-22)

• add requirements files to distribution

0.5.2 (2017-07-22)

• add ability to download other infrastructures besides just roads/paths (e.g., rail lines, power lines, etc.)
• calculate graph edges' bearings
• add ability to get nearest node by great circle or euclidean distance
• move examples/demo notebooks to new repo: osmnx-examples
• fix docstrings
• fix building footprint downloads that require multiple calls for large areas
• fix missing MultiPolygon import in buildings module

0.5.1 (2017-05-12)

• functionality to clean-up and consolidate complex intersections
• let save_gdf_shapefile save building footprint GeoDataFrames
• set node color correctly in figure-ground diagrams

0.5 (2017-04-25)

• add elevation module to get node elevations and street grades
• new color sequence creation and conversion functions in plot module
• new function to get a path's edge attribute values
• gracefully handle subpolygons that are invalid or have zero area
• make truncate_graph_polygon work on projected graphs
• plot_shape accepts a color or a list of colors
• make all requests to Overpass API set custom user-agent and referer
• rewrite algorithms to convert multidigraphs to multigraphs

0.4.1 (2017-04-01)

• fix load_graphml so we can save a graph again after loading it
• fix load_graphml so edge oneway attribute is not always set to True
• buildings module gets buildings stored in OSM as relations as well as ways
• fix figure-ground diagram saving to make perfect square and smooth joints
• add optional graph argument to plot_figure_ground
• suppress jupyter notebook deprecation warnings

0.4 (2017-03-01)

• plot entire networks with folium
• plot routes on top of networks with folium
• vectorize all great circle calculations
• new geocode function in utils
• remove geopy dependency
• refactor modules
• simplify before truncating by distance when getting graph by point and network distance
• project geometries, GeoDataFrames, and graphs to a passed-in CRS

0.3.1 (2017-02-15)

• clean up docstrings throughout
• remove network code vestiges from buildings.py

0.3 (2017-01-29)

• add route plotting with folium
• add downloading and visualization of building footprints
• updates for compatibility with matplotlib 2.0

0.2.2 (2017-01-20)

• fixes for compatibility with networkx 2.0's new API
• make png default image save format
• figure-ground plots collect street network from a wider area

0.2.1 (2017-01-11)

• add license file to dist package

0.2 (2017-01-10)

• refactor modules
• add graph to GDF and GDF to graph functions
• add encoding argument to save_graph_shapefile
• add unit tests and continuous integration

0.1 (2016-12-19)

• add street width attribute for ways from OSM

0.1b2 (2016-11-29)

• make simplification error messages explicit

0.1b1 (2016-11-28)

• process land use and area tags from OSM
• make intersection error messages clear

0.1a1 (2016-11-07)

• first pre-release