Adds a .yml option: photos_as_resource_pages
If set to true, default behaviour will be changed to produce
- a directory `name` for the album instead of one `name.md` file
- an `_index.md` for the album inside this directory
- a `name.md` for every photo inside the same directory
Key properties of the photos will be saved in the front matter.

This change provides the basis for users who want to use keywords
to generate automatic collections of pages using Hugo's taxonomy
and have more finetuned control over the data being used to generate
the album.

To optimally use this new functionality, the user will need to
deploy new list templates that repicate the {{< wrap >}} and
produce the desired output.

Adds a .yml option: generate_branch_bundle
If set to true, default behaviour will be changed to produce
- directory `name` for the album instead of one `name.md` file
- `_index.md` for the album inside this directory
- `name.md` for every photo inside the same directory
Key properties of the photos will be saved in the front matter.

This change provides the basis for users who want to use keywords
to generate automatic collections of pages using Hugo's taxonomy
and have more finetuned control over the data being used to generate
the album.

To optimally use this new functionality, the user will need to
deploy new list templates that repicate the {{< wrap >}} and
produce the desired output.

Use PIL's TAGS to deal with EXIF. Use
iptcinfo3 to deal with IPTC tags. Allows to
use these as fallback options for copyright
and caption of photos.

As a sample use-case also implements the
fallback for the photo album to be determined
from the set of photos in it.

Will not change the default behaviour without
adding the setting tag_map, exif or iptc to
the configuration file.

Returns None instead of raising AttributeError when accessing
a setting that is not defined.

Remove unused imports
Add iptcinfo3 to the project requirements
Tidy up some wording

# Conflicts:
#	docs/README.md
#	hugophotoswipe/album.py

Do not overwrite the hps.yml config file after every run.

hps new: quit bitching about existing folders. Now
specifically checks if the album.yml file already exists
instead of the folder itself.

_load_albums: Look for nested albums

Switch default logging level to INFO and verbose to DEBUG.
Replace print() with logging.INFO/WARNING in hps.py
Include level & function in logging message
Reduce verbosity of _load_albums

Photo() returning an object even if the file has been removed.

Photo() returning an object even if the file has been removed. We moved
this test to album.update() with a try clause so that the album.photos
will only ever return actual photos.

Updated the _load_albums() to call new() album when setting enabled
and the album doesn't exist yet.

- Remove exif based copyright from album.py.
  It unnecessarily complicated matters.
- Remove memory leak in calling PIL.Image.open() by encapsulating
  in a with block.

number of simultaneous open files.

Use PIL's TAGS to deal with EXIF. Use
iptcinfo3 to deal with IPTC tags. Allows to
use these as fallback options for copyright
and caption of photos.

Will not change the default behaviour without
specifying the setting tag_map, exif or iptc to
the configuration file.

Ignores local changes (photo_exif & branches) but realignes with upstream improvements.

Catch-up to master

Use PIL's TAGS to deal with EXIF. Use
iptcinfo3 to deal with IPTC tags. Allows to
use these as fallback options for copyright
and caption of photos.

Will not change the default behaviour without
specifying the setting tag_map, exif or iptc to
the configuration file.

Also add test cases for improperly formatted tags.

Need a more robust solution to extract arbitrary attributes. For now, removing this from this branch.

iptcinfo spews many warnings about missing IPTC data, reading before image or decoding error. Most of the time this just seems to mean that the desired tags aren't present.

# Conflicts:
#	docs/README.md
#	hugophotoswipe/photo.py
#	tests/test_photo.py

Adds a .yml option: generate_branch_bundle
If set to true, default behaviour will be changed to produce
- directory `name` for the album instead of one `name.md` file
- `_index.md` for the album inside this directory
- `name.md` for every photo inside the same directory
Key properties of the photos will be saved in the front matter.

This change provides the basis for users who want to use keywords
to generate automatic collections of pages using Hugo's taxonomy
and have more finetuned control over the data being used to generate
the album.

To optimally use this new functionality, the user will need to
deploy new list templates that repicate the {{< wrap >}} and
produce the desired output.

(cherry picked from commit be88345)

Note: Was not detected in test suite because all test images have exif['Orientation'] = None.