Add post model

* Has title, content, user, and club
* Each field is required (null: false)
* Index on title, user, and club
Add tests for post

* Respond to attr
* Belongs_to and has_many for user and clubs
Add doctor lorem for testing
Add new post to club with validation

* Check only members see 'new post' in club
* Added post controller
* Method for checking member for posts (no test yet)
Add create method for post and content test
Add club->post view (with tests)
100% Coverage and fix zeus+simplecov issue

* Coverage mainly for controllers needed
Add created and user email to respective posts