Added version file. Updated version info.

py_tools_ds/__init__.py

 # -*- coding: utf-8 -*-
 from __future__ import (division, print_function, absolute_import, unicode_literals)
+from .version import __version__, __versionalias__
 
-__version__ = '0.13.1'
-__versionalias__ = '20171206_02'
 __author__ = 'Daniel Scheffler'
 
 # Validate GDAL version

py_tools_ds/version.py

+__version__ = '0.13.2'
+__versionalias__ = '20181203_01'

setup.py

@@ -11,6 +11,10 @@ with open('README.rst') as readme_file:
 with open('HISTORY.rst') as history_file:
     history = history_file.read()
 
+version = {}
+with open("py_tools_ds/version.py") as version_file:
+    exec(version_file.read(), version)
+
 requirements = ['gdal', 'numpy', 'shapely', 'six', 'rasterio', 'pandas', 'geopandas',
                 'scikit-image', 'pyproj', 'spectral']
 setup_requirements = []  # TODO(danschef): put setup requirements (distutils extensions, etc.) here
@@ -18,7 +22,7 @@ test_requirements = requirements + ["coverage", "nose", "nose2", "nose-htmloutpu
 
 setup(
     name='py_tools_ds',
-    version='0.13.1',
+    version=version['__version__'],
     description="A collection of Python tools by Daniel Scheffler.",
     long_description=readme + '\n\n' + history,
     author="Daniel Scheffler",