Added experimental grid to canvas.
Changes didn’t take so committing again.
Grid is displaying now.
Snap to grid is working.  Current example demonstrates a 10x10 grid and doesn’t allow modification of those settings.
Added settings view controller to control the size of the grid.
Turned off the grid as default.
Lightened the grid lines and changed the minimum value of the slider to 1, which represents off.  It used to start at 0.
Fixed a bug caused by the last commit that would scale the grid height to one when the minimum value of the slider was set to 1.
Moved CGContext setup code outside of a loop.
Removed initWithNibName, which was incorrectly initializing itself anyway, as it’s not used.
Merge pull request #51 from mhogenso/canvas_grid

Canvas Grid