Disable Python 2.5 in travis runs.

Upstream nose2 isn't compatible.
Added simple command line tool example.

I'd like to import sbntool, but I can't track down all the contributors :/
Bumped copyright years.
Clean up Sphinx configuration.

All of the boilerplate stuff just gets in the way when you're changing options.
Include requirements files in sdist output.
Enable Sphinx spellchecking, if available.