Base function for "Get Ready" UI screen from #163 WIP

This WIP pull request has the basic GET and some of the POST functionality for the #163 feature.

* You can access it from /dashboard/getready and test the basic deployment create & node assign function.
* There are several areas that are still stubs: network create and OS assignment.
* Also, display of the status LED.
* INCLUDES BDD TESTS for GET.

This will NOT be connected to the menu until functionality is complete so it is safe to accept this WIP into trunk pending review.  We will talk about the design on the 6/25 design meeting.