Reorder videos

This implements functionality to allow user to reorder videos in their queue and to change ratings on the fly.
Note that because of extensive error checking, I could not make the controller code as skinny as I would have liked.  There remains a fair amount of logic still in the controllers.

Also, would like to get feedback on whether the Video class is the right place to put some logic related to updating review ratings for the videos.

Could you elaborate on this?  I think the solutions omit the method, which I assumes maps to POST in that case anyway.  So under what circumstances would I favor a put vs a post?
Does it have to do with whether the user is updating and existing resource as opposed to creating a new one?