Make explicit witch version of python is supported.

setup.py

@@ -41,6 +41,13 @@ Operating System :: Microsoft :: Windows
 Operating System :: POSIX
 Operating System :: Unix
 Operating System :: MacOS
+Programming Language :: Python :: 2
+Programming Language :: Python :: 2.4
+Programming Language :: Python :: 2.5
+Programming Language :: Python :: 2.6
+Programming Language :: Python :: 2.7
+Programming Language :: Python :: 3
+Programming Language :: Python :: 3.3
 """
 NAME                = 'Theano'
 MAINTAINER          = "LISA laboratory, University of Montreal"