Fix #262: room invitation method

commit a2c32b6f2d2e7b974873806b8e2f60f58eea2b55
Author: Ben Klang <bklang@mojolingo.com>
Date:   Wed Jul 2 19:28:12 2014 -0400

    Add new room invitation method
Fix #262: jshint, comment & xmlns

- JSHint was reporting some small mistakes
- Comment was referring the wrong function
- XMLNS should be taken from Strophe.NS
Fix version to reflect dev