Adding contrib modules to setup.py

Adding contrib modules to setup.py. Thank you @iromli and @pcraig3!

Inline configuration contribution

Adding the ability to have feature flags inline instead of in a dictionary, to make it easier to interoperate with other Flask extensions, e.g. Flask-AppConfig.

A big thank you to Isman Firmansyah (@iromli) for the contribution!

0.5 - release the contrib!

Official support for contributed modules, thank you to iurisilvio! He contributed the first for
SQLAlchemy, so you can store your flags in the database instead.

Contributions for other storage backends welcome!

PyCon 2014

• General code cleanup, modernization and optimization
• Adding optional redirect to is_active_feature, thank you to michaelcontento
• Fixed syntax error in docs, thank you to iurisilvio