Add namespaced Posts controller which creates a topic and first comment from a single request
Remove dependencies
Merge pull request #4 from LessonPlanet/sw/create-topic-and-comment-from-single-endpoint

Centralize Posting New Topic and First Comment
Merge custom current user providers
Refactor Lp::PostsController by wrapping creators in a transaction and adding exceptions to errors response
Merge branch 'development'

Conflicts:
	app/controllers/lp/posts_controller.rb
	config/routes.rb
	lib/auth/lp_current_user_provider.rb