Updating delete method to return Response object

Currently it either returns null or throws exception.
Add test to ensure delete method returns Response object
Merge pull request #332 from jamiehannaford/working

Updating delete method to return Response object
Adding test to try and delete non-empty container.
Merge pull request #333 from ycombinator/working

Adding test to try and delete non-empty container.
Proposal to fix the user creation issue with OpenStack