First steps on new step design.
Basics of edit step view model/controller down.
Finished step view controller.
Merge pull request #3 from AshFurrow/steps

Adding/Editing Steps
Completed C-41 recipe.
Completed Delta 3200 recipe.
Added duration to step editing view controller/model.
Adds a comment.
Fixes #4.
Added ASHDetailViewModel.
Finished ASHDetailViewController.
Added ASHTimerViewController.
Basics of play/pause.
Added icon.
Updated icon.psd.
Updated icon.
Detail view controller title.
Renamed some properties on detail view model.
Added missing @dynamic directive.
Fixed typo in managed object model.