implement WebSocket origin checking (fixes #28)
Merge branch 'master' of github.com:crossbario/crossbar
Merge commit '219c9e74f745b6b2eb374132e6755fc1dfef6ac5'

* commit '219c9e74f745b6b2eb374132e6755fc1dfef6ac5':
  implement WebSocket origin checking (fixes #28)