Add a few embellishments for Pypi

Author: Marco Paolini

setup.py

@@ -28,13 +28,19 @@
     package_data={'graphql_parser': ['*.pxd', '*.pyx']},
     include_package_data=True,
     ext_modules=extensions,
+    license='BSD',
+    keywords=['graphql', 'parser', 'libgraphql'],
     classifiers=[
         'Development Status :: 3 - Alpha',
         'Environment :: Console',
         'Environment :: Web Environment',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: BSD License',
         'Operating System :: POSIX :: Linux',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Software Development :: Libraries :: Python Modules',