Automatically generate the version number for docs

Reuse the code from setup.py to generate the proper version
number for the Sphinx documentation.

Author: deejay1

docs/conf.py

@@ -11,6 +11,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 import os
+import re
 import sys
 
 
@@ -63,10 +64,15 @@ def __getattr__(self, name):
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-version = '2.0'
 # The full version, including alpha/beta/rc tags.
-release = '2.0.1'
+release = ''
+here = os.path.abspath(os.path.dirname(__file__))
+with open(os.path.join(here, '..', 'kazoo', 'version.py')) as f:
+    release = re.search(r'^__version__\s*=\s*[\'"]([^\'"]*)[\'"]',
+                        f.read(), re.MULTILINE).group(1)
+
+# The short X.Y version.
+version = '.'.join(release.split('.')[:-1])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.