Add playback of first available video on the page

In case when you only provide a user profile url (e.g. http://www.youtube.com/esgn) this workaround scans for the first "/watch?" link available (if the user if live right now it will be a stream, otherwise a featured video)
Merge pull request #291 from unintended/patch-1

Add playback of first available video on the page
Merge remote-tracking branch 'upstream/develop' into develop