Add missing license information (originally specified in README). Correct install instructions.

setup.py

@@ -18,6 +18,7 @@ setup(
     author=github2.__author__,
     author_email=github2.__contact__,
     url=github2.__homepage__,
+    license='BSD',
     platforms=["any"],
     packages=find_packages(exclude=['ez_setup']),
     scripts=['github2/bin/github_manage_collaborators'],
@@ -27,6 +28,7 @@ setup(
         "Development Status :: 3 - Alpha",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
+        "License :: OSI Approved :: BSD License",
     ],
     long_description=codecs.open('README.rst', "r", "utf-8").read(),
 )