Updated RTMP provider. fixes #8

I've added support for RTMP playback. I also have a pull request I'll send in the next day to the video-js project for the same. 

These additions I actually made last year and have been using in production on several sites without any issues so far. 

I'm not a seasoned actionscript developer, but this also wasn't that complicated. I have no doubt there's more elegant ways of handling some of my bandaids. The biggest obstacle I encountered with the RTMP playback is that stream events do not behave the same as progressive playback, so external events wouldn't trigger when needed, or even at all.