Merge pull request #33 from daniellemayne/develop

Develop - caching fixes, remove volume and create subnet fixes, allow cloud errors to bubble up
Merge pull request #35 from daniellemayne/develop

bugzid: 3305 set cidr mask to /32 if single ip address passed (develop)
Merge pull request #37 from daniellemayne/develop

bugzid 3400: ensure data center id of subnets and vlans is populated(develop)