Fix Flask.url_for, allow werkzeug route, cleanup
Fix Flask.url_for, allow werkzeug route, cleanup

* Fixes https://github.com/kennethreitz/flask-sockets/issues/6
* Integrates https://github.com/kennethreitz/flask-sockets/pull/18
* Integrates https://github.com/kennethreitz/flask-sockets/issues/19

fub-vetbib/flask-sockets