Added an example on saving the video-stream

As you can see, I can't just pipe the parser output to the file and need to process it to extract the payload. This relates to the discussion in Issue #17.

- I +1 for updating PaVE parser to make this example simpler, however this breaks two tests
- the new client.getVideoStream method could return a parsed stream, we could add a getRawVideoStream to get the unparsed version

Please comment and i'll update the pull requests with these changes based on your feedback