Issue #421 merging with master and generating controllers
Issue #421 created tabs in new view ,index view assignment_problems controller
Issue #421 create in assignment problems
Issue #421 fetching from database problems belong to certain course and showing them in index view
Issue: #110 - Change some buttons into icons
Issue: #110 - Add control top-bar
Issue #421 checkboxes for index view
Issue: #110 - Add png files
Renaming index file related to tips,model_answers,test_cases controllers
Renaming index file related to hints controller
Issue #506 editing create method in problems controller
Issue #506 editing edit method in problems controller
Issue #506 editing new method in problems controller
Issue #506 editing destroy method in problems controller
Issue #506 editing update method in problems controller
Issue #506 adding private params method in problems controller
Issue #506 putting wizard tabs in new.html problems controller
Issue #506 editing _decription.html problems controller
Issue #506 editing edit view in problems controller
Issue #506 editing title view in problems controller