Move example specs to dummy

Run specs using MAS Development Dependencies as we would expect a
consuming application to.
Move example Cucumber features to dummy

Run cucumber using MAS Development Dependencies as we would expect a
consuming application to.
Require MAS Development Dependencies in dummy as we would expect
Add a no-op 'test:prepare' task hook for Cucumber
Improve formatting of Cucumber env
Don't track our dummy databases
Add generator for Cucumber install