Adds support for proper versioning

CHANGES.md

@@ -0,0 +1,7 @@
+Changelog for git-cc
+====================
+
+1.0.0 (unreleased)
+------------------
+
+- Started versioning at 1.0.0

git_cc/__init__.py

@@ -0,0 +1 @@
+__version__ = '1.0.0.dev0'

setup.cfg

@@ -0,0 +1,2 @@
+[zest.releaser]
+python-file-with-version = git_cc/__init__.py

setup.py

@@ -1,7 +1,28 @@
 # -*- coding: utf-8 -*-
 
+import os
+import re
+
 from setuptools import setup, find_packages
 
+# The following approach to retrieve the version number is inspired by this
+# comment:
+#
+#   https://github.com/zestsoftware/zest.releaser/issues/37#issuecomment-14496733
+#
+# With this approach, development installs always show the right version number
+# and do not require a reinstall (as the definition of the version number in
+# this setup file would).
+
+version = 'no version defined'
+current_dir = os.path.dirname(__file__)
+with open(os.path.join(current_dir, "git_cc", "__init__.py")) as f:
+    rx = re.compile("__version__ = '(.*)'")
+    for line in f:
+        m = rx.match(line)
+        if m:
+            version = m.group(1)
+
 with open('README.md') as f:
     readme = f.read()
 
@@ -10,7 +31,7 @@
 
 setup(
     name='git_cc',
-    # version=version,
+    version=version,
     description='Provides a bridge between git and ClearCase',
     long_description=readme,
     author="Charles O'Farrel and others",