Allow a custom video quality to be specified (at the model level,
user can't do it yet).

https://github.com/moreginger/xbmc-plugin.video.ted.talks/issues/37
Correctly set up parseDOM / CommonFunctions.

https://github.com/moreginger/xbmc-plugin.video.ted.talks/issues/33
Don't fetch/parse two URLs for RSS, especially as for some time the link
provided was to the talk page, not directly to the video :S

https://github.com/moreginger/xbmc-plugin.video.ted.talks/issues/33
Allow video quality to be set.

https://github.com/moreginger/xbmc-plugin.video.ted.talks/issues/37