Disabled initial cells, set cell text to different color. Tested: iOS Simulator
Create gridModel class.
Wrote GridModel, copying the initial grid from view controller. Wrote the rules for checking row, column and block consistency for a given value against a given grid, not yet tested.
Created NumPadView class.
Implemented NumPadView and linking the GridModel with the ViewController, basic functionality works. Tested: iOS Simulator.
Added image creation utility class.
Fixed style - asterix with name, not type for pointers.
Added unit testing for Grid Model.
Merge pull request #2 from kateaplin/gridModel

Grid model