Merge pull request #32 from daniellemayne/2013.07

2013.07 - caching fixes, remove volume and create subnet fixes, allow cloud errors to bubble up
Merge pull request #34 from daniellemayne/2013.07

bugzid: 3305: set cidr mask to /32 if single ip address is passed (2013.07)
Excluded tests
[maven-release-plugin] prepare release dasein-cloud-openstack-2013.07.2
[maven-release-plugin] prepare for next development iteration
Merge pull request #36 from daniellemayne/2013.07

bugzid 3400: ensure data center id of subnets and vlans is populated (2013.07)