get doc version via installed distribution

docs/conf.py

@@ -12,6 +12,9 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+import pkg_resources
+dist = pkg_resources.get_distribution("isso")
+
 import sys
 import os
 
@@ -54,11 +57,14 @@ copyright = u'2013, Martin Zimmermann'
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
+
+from distutils.version import LooseVersion
+
 #
-# The short X.Y version.
-version = '0.5'
 # The full version, including alpha/beta/rc tags.
-release = '0.5.1'
+release = dist.version
+# The short X.Y version.
+version = "{0}.{1}".format(*LooseVersion(dist.version).version)
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.