Merge branch 'C4_Husseny_208_edit_problem_4.5' of https://github.com/alaashafaee/Coolsoft-14
Added update method and show method and edit method in Posts controller
changed the view of the discussion board to have title as a link to the post
added edit html page in the views of the Post and added a show view for the post
fixing conflicts with master
Issue 297 Drop down list of tracks and edit track
Issue 297 pulling Issue 208 branch for sync and resolving conflicts
fixing conflicts in routes with master
installed missing gems and changed in the edit post view
addin hints controller and its view
Adding validations for the hint model
fixing conflicts with the master
changing in the posts controller and in the views of the edit and show
modifying hintsCntroller
added post route for update
Adding documentation and indentation for my  methods and views
Added destroy method in the post controller
added button delete post in the post edit page
Modified the show view of the posts
modify hint controller wen show view and add the route