Added versioneer to setup.py requirements, set it so that git commit hashes appear in versions. Versions now determined by git tags (#54)

Author: josephhardinee

.gitattributes

@@ -0,0 +1 @@
+pydisdrometer/_version.py export-subst

MANIFEST.in

@@ -1 +1,3 @@
 include pydisdrometer/utility/metadata.json
+include versioneer.py
+include pydisdrometer/_version.py

pydisdrometer/__init__.py

@@ -15,3 +15,8 @@
 from . import utility
 from . import fit
 from .plot import plot
+
+
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions