Improve whitespace docs to reflect reality.

See also:
https://groups.google.com/d/msg/pocoo-libs/6DylMqq1voI/GXTbZJ1Tr-sJ
Merge pull request #137 from PaulMcMillan/improve_whitespace_docs

Improve whitespace docs to reflect reality.
Added filesize part to the module compiler.  This fixes #131 for 3.3 and later
Fixed an unicode error after 2to3
- Initial attempt at allowing macro parameters in context
- Macro parameters are now in context