Adds Python implementation trove classifiers, PyPy, CPython and Jython

setup.py

@@ -152,6 +152,9 @@ setup(
         "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: Implementation :: CPython",
+        "Programming Language :: Python :: Implementation :: PyPy",
+        "Programming Language :: Python :: Implementation :: Jython",
     ],
     entry_points={
         'console_scripts': console_scripts,