Convert README to rst for PyPI
Make compat-unicode the default

Closes gh-8
Rewrite description of unicode literal options in README
Update Github URL in setup.py
Remove spurious PHP classifier
Convert CHANGELOG to rst.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
Fix an error in README.rst and add CHANGELOG entry for the Unicode literal change.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
License clarification and typo fixes.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>