Initial wizard implementation

Submit and cancel buttons need to get tweaked to carry different labels, wizard should work as it is now,
submit button should lead to next wizard step. I think it keeps redirecting to first step because
in update action we need to use render_wizard @deployment which depends on OpenstackDeployment model existence.

Added staypuft layout that enables to add custom stylesheets, js etc.
Merge pull request #7 from jtomasek/wizard

Initial wizard implementation