Fixed ID parsing bug that broke the plugin... 

... when the embed URLs stopped using query strings.

This change tells the script to stop reading in the ID when it finds either a question-mark character or a double-quote character, whichever comes first.  This allows the add-on to work again with BOYT's current HTML markup, which embeds videos like this:

<iframe width="504" height="306" src="//www.youtube.com/embed/KcBS823VTbU" frameborder="0" allowfullscreen></iframe>