Added get_medusa_paths method to Page

This is used to find a list of URLs for the entire site to feed into django-medusa
If your page requires extra views, you can override this like so:
def get_medusa_paths(self):
    yield '/myextraview/'
    super(MyPageType, self).get_medusa_paths()
Added medusa renderer for pages
Fixed typo
Added contrib folder
Moved medusa renders into their own app in contrib
Added medusa renderer for documents
Renamed get_medusa_paths to get_staticsite_paths
mention some more optional/required dependencies in 'getting started' docs
Added document describing how to generate a static website
Renamed get_staticsite_paths to get_static_site_paths
Added unit tests for get_static_site_paths
Added changelog entry
Merge pull request #249 from kaedroho/medusa-integration

Django-medusa
Missing underline for new static generation docs
Include static site generation docs in doc index
Removed stray print statement
Merge branch 'master' into form-builder