Adds tests for Post model
Adds Tags, Tagging and relevent assocations with Post
Adds ability to delete posts current user created
Adds ability to edit only current_user's posts
Adds ability to tag postsand view all posts with that tag
Lets user add multiple tags
Fixes new tags being created when old tags already exist
Fixes bug with creating new tags. Adds association tests for tag and tagging models
Fixes tag delete bug
Adds input box to follow another blog
Adds ability to unfollow a blog
Updates .rspec file to show more
Minor styling