Attempt to automate version numbers from git

setup.py

 from setuptools import setup, find_packages
+import subprocess
+import os
+import datetime
 
+dir_path = os.path.dirname(os.path.realpath(__file__))
+try:
+    version = subprocess.check_output(['git', '-C', dir_path, 'describe', '--tags', '--dirty', '--always'])
+except subprocess.CalledProcessError:
+    date = datetime.datetime.now().strftime('%Y%m%d')
+    version = '0.1.dev-' + date
 
 setup(
     name='vcsinfo',
-    version='0.1.dev0',
+    version=version,
     description='Python abstraction layer for getting info from VCSes sych as git',
     url='https://gitlab.astro-wise.org/omegacen/vcsinfo',
     license='LGPL-3.0+',