setup.py: Add Python 3 (and Python 2) classifiers

Author: msabramo

setup.py

@@ -44,6 +44,12 @@
         "Operating System :: Microsoft :: Windows",
         "Operating System :: MacOS :: MacOS X",
         "Programming Language :: Python",
+        "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 2.6",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.3",
+        "Programming Language :: Python :: 3.4",
     ],
     long_description=long_description,
 )