Wrote model for posts in communication app
Added tests for Post Views.  Part of issue #10
Added create view and updated details view.  Part of issue #10
Added edit and delete views.  Part of issue #10
Added CC-BY license to all posts
Fixed errors in test runners
Added RSS syndication for posts
Hooked posts feed into feeds page
Hooked posts into sitemaps framework.  Closes #10
Merge branch 'posts'