OSMF SVN

Add constants for VAST MediaFile delivery type.

Adjust test asset URL to avoid test failures caused by crossdomain/localhost interaction.

Added the concept of setting the MAST URL in the metadata of the resource for a media element.

Add dynamic buffering example to ExamplePlayer.

Updating prototype with latest tweaks resulting from writing the specification.

Add VAST media file resolver. Centralize supported video MIME types into a framework constants class.

Add support for merging inline and wrapper ads. Currently limited to impressions and tracking events, we'll need to merge companion ads and nonlinear ads once we support them in the playback layer.

Add more unit tests for VAST validation.

Add support for strict validation of VAST documents during parsing.

Add parser support for the Video tag. Add unit test for an empty document.