Update trove classifiers for various python3 lists

PyPi specifically needs "Programming Language :: Python :: 3" (not 3.1 or 3.2) to add pymongo to the "Python 3 Packages" list.

Author: behackett

setup.py

@@ -277,10 +277,12 @@ def build_extension(self, ext):
  "Operating System :: MacOS :: MacOS X",
  "Operating System :: Microsoft :: Windows",
  "Operating System :: POSIX",
+ "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 :: 3.1",
  "Programming Language :: Python :: 3.2",
  "Programming Language :: Python :: Implementation :: CPython",