Adds Quantum API methods - CRUD for Network, Subnet, Port
Bump version and gemspec for Quantum code
Fix for pull request 22 - content-length 0 on PUT container

https://github.com/ruby-openstack/ruby-openstack/pull/22
Quantum - deal with Quantum errors (messages back to client)
Merge pull request #23 from marios/master

Quantum API methods (pull request 23) and fix for nginx create_container content-length (pull 22)