added crud for articles.
moved the method to check if the correct user is trying to perform an action, i.e. to edit a profile. This is now moved into the sessions helper, so it can be used from anywhere.
added user permissions. another user cannot edit or delete an article.
added assocation in user model. added code to retreve the sspecified article for the show action of article controller. changed view to display the name of the author.
Merge branch 'master' into wiki
added method in the article model to return articles with status = 2 for approved.
Revert "added ajax to the follow/unfollow buttons on the user profile page."

This reverts commit 07aa787f130cd5fd5dfb90e36a24d4f3a2f65cb9.
changed education create and show action to custom and not scafold code. added error partial in the education new form.
added university and course dropdown lists, which get the names of universities and courses and pass the id on submit. also created user-friendly labeles.
Merge branch 'wiki' into educations
added validations in the education model to validate for user id, course id and university id. also fixed educations params in educations controller.