Added StatusStatus containing constants for stack statuses (like CREATE_IN_PROGRESS, etc).
Refactored "stacks" -portion to individual file in heat example
Refactored heat stack-resource-type related operations into dedicated client in heat-examples.
Refactored heat stack-resource-type related operations into dedicated client in heat-examples.
Refactored stack resource -portion of the heat apis into a dedicated file (in heat-examples).