#443 added edit action to contests controller
#443 added update action and contest_params definition in contests controller
#443 added view for edit page
#443 added contests resources to routes
#443 added documentation for contests controller
#443 fix in database insertion
#443 added logic to fix DB insertion for course
#443 added delete action in contests controller
#443 removed unnecessary delete action and added destroy action
#443 removed unnecessary comment in the edit view
Adding form of grade creation and controller grades and action create grade
 Issue #434 resources controller and routes
 Issue #434 resources views
 Issue #434 resources action new
 Issue #434 add top side bar
 Issue #434 action new routes
#447 added add_problems action in contests controller
#447 added initial view for add problems page
#447 view fixes, now name and description show correctly
 Issue #434 models modification