Remove upper limit from django version in setup.py.
System encoding might not be utf-8

Eliminates UnicodeDecodeError when opening README.rst if system encoding is not utf-8
Merge pull request #579 from ecederstrand/patch-1

System encoding might not be utf-8
Merge pull request #577 from prestontimmons/setup-version

Remove upper limit from django version in setup.py.
Fix #565 -- Replace render with render_to_response.
Flake8.
Fix #549 -- Avoid breaking on mod_python.

(Please don't use mod_python.)