Branch/audio

@eric79 @youngca 
Two separate (model and view)drivers that are based on buzz.

http://buzz.jaysalvat.com/

vwf/model/buzz

and 

vwf/view/audio -> basically Rob's driver which has just been cleaned up to out coding standards.


@eric79 @davideaster 
play is a function of the sound, not a property.  So, if by chance play is set to true before the source/url is set then I thought autoplay would be the thing to set.  I'm ok with whatever, but this is another situation where we really want a set of properties to be set at creation.  I've started thinking that maybe setting the 'source' during creation is a cleaner way of doing this.  I'm also not a 100% on the sound.vwf.yaml api.  This was just a first stab at getting things functional.