Issue #484 adding notes
Iusse #484 adding notes table
Conflicts:
	tutor/Gemfile
Issue #496 adding Notifications
Adding CKeditor
Merging database_migrations into dev_database
fixing indentaions and convintions
Merge branch 'database_migrations' into dev_database

Conflicts:
	tutor/db/migrate/20140513171629_create_notifications.rb
Issue #518 with some default values
Merge branch 'database_migrations' into dev_database

Conflicts:
	tutor/db/migrate/20140323111235_create_students.rb
	tutor/db/migrate/20140323111711_create_replies.rb
	tutor/db/migrate/20140323112245_create_problems.rb
	tutor/db/migrate/20140323112347_create_solutions.rb
	tutor/db/migrate/20140323112502_create_tracks.rb
Issue #523 changing attrebutes
Merge branch 'database_migrations' into dev_database

Conflicts:
	tutor/db/migrate/20140505095450_create_contests.rb
fixing test cases
Merge branch 'database_migrations' into dev_database

Conflicts:
	tutor/db/migrate/20140323113417_create_test_cases.rb
Merge pull request #507 from alaashafaee/dev_database

Pull Request : Dev database
Issue #491, fixing conflicts with master
Issue #491, adding documentation
Issue #491, mofifying seeds