Merge pull request #7 from tiger-swallowtails-2013/posts_and_topics_initial_routes_views

Posts and topics initial routes views
add post_controller, application.html.erb and index.html.erb
connect new posts to topic_id
fix route for posts
Merge pull request #8 from tiger-swallowtails-2013/post_functionality

Post functionality
fix merge conflict with main