Refactor PostsController
1) old school hash :id => 'code' to id: 'code'
2) The create method. From querying from Post.new(post_params) to
current_user.posts.build(post_params)

This resulted in a 174 times faster INSERT into SQL. (69.9ms => 0.4ms)
Refactor how membership is deleted. Previously it was being done in the
Membership model. Now there is a destroy method in MembershipController
that handles the deletion