Fix vaughnlive.tv

fixes #575 

Looking at [this xbmc plugin](https://github.com/HIGHWAY99/plugin.stream.vaughnlive.tv/blob/master/default.py#L248) and its [info file](https://github.com/HIGHWAY99/plugin.stream.vaughnlive.tv/blob/master/info-vaughnlive.tv.txt) referenced by @potentate, it doesn't seem the secure_token, port, and geo_code variables are needed anymore. It also seems the swf url is given in the response, so I took their approach and used that in the rtmp request.

The video token format seems to have changed from [this](https://github.com/HIGHWAY99/plugin.stream.vaughnlive.tv/blob/master/info-vaughnlive.tv.txt#L46) to `[ip]:[port];:mvnkey%[token]`, and doesn't require any of the transformations used previously to make it work.