Add python 2.7 in the list of supported python versions.

setup.py

@@ -87,6 +87,7 @@ setup(
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.5",
         "Programming Language :: Python :: 2.6",
+        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.0",
         "Programming Language :: Python :: 3.1",