Added destroy method in the problems controller and added documentation
Added button delete problem in the Edit view of the problem
Fixed a minor mistake in id passed of the track
typo in track' controller s name in redirect
Fixed indentation in the method destroy
break down long lines
Fixed commas as Mamdou7's comment
added a space
fixing tab
Merging master with my branch and fixing conflicts
gem
Fixing conflicts with master
Fixing conflicts in problem controller
Fixed typo
Merge pull request #335 from alaashafaee/C2_Atef_Remove_Problem_4.18

Pull Request : C2 _Atef_Remove_problem 4.18