Remove Py2.6/3.3 compatibility markers from setup.py metadata.

setup.py

@@ -14,7 +14,7 @@ is_cpython = platform.python_implementation() == 'CPython'
 
 # this specifies which versions of python we support, pip >= 9 knows to skip
 # versions of packages which are not compatible with the running python
-PYTHON_REQUIRES = '>=2.6, !=3.0.*, !=3.1.*, !=3.2.*'
+PYTHON_REQUIRES = '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*'
 
 if sys.platform == "darwin":
     # Don't create resource files on OS X tar.
@@ -263,7 +263,6 @@ setup(
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.4",