New project metadata.

- Rechristen project "sm-openid", where "sm" stands for "Software
  Maniacs".
- New setup.py, MANIFEST.in
- Drop requirements.txt in favor of install_requires option in
  setup.py
Include only Python 3.4 in setup.py and tox.ini.
Updated .travis.yml
Removed NEWS.md. Just one news file is enough (CHANGES.md).
Drop test_examples, they are never run anyway.
Remove unused import from test/__init__.py