Adding form of grade creation and controller grades and action create grade
Issue #504 fixing conflict
Issue #504 remove unneccesary code
Issue #504 fixing seeds, fixing view and dialog boxes, handling failure demos, routes addition & documentation
Issue #504 adding specs
Issue #504 fixing indentation
Issue #504 fixing seeds
Issue #504 fixing spacing
Issue #504 deleting spec helper
Issue #504 adding specs in controller and fixing specs in model
Issue #504 fixing indentation
Issue #504 fixing conflicts with master
Issue #504 fixing specs in grade model
Merge pull request #511 from alaashafaee/C4_Husseny_504_Grade_Solution_4.30

Pull Request: C4_Husseny_504_Grade_Solution_4.30