Added Resource Class Controller
resource class db model and methods
Merge pull request #3 from mfojtik/racks_v2

Improvements to Rack JSON serialization
Merge pull request #4 from mtaylor/resource_class

Initial resource class work
Removed Blaa and Sausage models/controllers
Added Chassis representation type, some basic refactoring
Added Capacity representation to controller
More refactoring and added delete_rack()