Updated updated RTMP provider. fixes #8

This pull request has the commits from https://github.com/videojs/video-js-swf/pull/17 within it.  It also:

- fixes the merge issue with pull 17
- adds a few more empty methods required by NetConnection with some streams to not throw errors

These changes have been tested against a wide variety of Akamai and Limelight rtmp streams, including live streams.  The only issues to report are that the end screen is black and that controls scrubbing performance can be choppy.  Nothing found that I think should prevent this pull request.

The related video.js request: https://github.com/videojs/video.js/pull/634