OSMF SVN

Changed location of regions sprite to new package for media player project.

Add examples for beaconing and VAST to ExamplePlayer.

Add hooks for processing trait add/remove events in ListenerProxyElement.

Updated the media player to use the RegionSprite.

Add sample app for VAST.

Treat invalid beacon URLs as ping failures.

Incorporate feedback from code review.

Additional unit tests for VASTTrackingProxyElement, covering the start, 1q, midpoint, 3q, complete, pause, and mute events.

Adding file missing from previous commit.

Adding HTMLGateway unit test, and applying more spec review changes (renaming IContainerGateway addChildElement and removeChildElement methods).