Add cssselect to requirements

This is no longer part of lxml.
Bump copyright years
Added alternatives document

If you know others, or spot errors, please drop me a mail.
Use default location for Sphinx output
[Tr] Set wheel packages as universal
[Tr] Remove unused docutils CSS file
Fix doc inclusion in sdists
Major reworking of the README
Clean up Sphinx configuration
Show errors when config/database loading fails
[QA] Add contributing doc
Use /usr/bin/env to start Python

This breaks the common case for me, but people who use virtualenv moaned enough
to make me switch ;)