Merge pull request #36 from julen/doc-fixes

Docs: small fixes, reworded some sentences
More automated docs
Merge branch 'master' of github.com:mitsuhiko/click
Updated readme a bit
Fixed a headline
Split up click into a package
Some performance improvements
Fixed #38
Some small fixes for problems
Allow to set defaults for bools to None
Changed how sub commands are invoked and made it clearer.
Added wheel config
A couple drive-by edits to the Python 2/3 docs
Merge pull request #39 from erikrose/patch-1

A couple drive-by edits to the Python 2/3 docs
Abort with a clear error message on Python 3 if the env is ASCII.
Clean up unicode handling
Added notes on unicode on python 3
Docs: several fixes