OSMF SVN

PARB changes: Remove MediaPlayerSprite, MediaContainer is now the sanctioned way to place media on the stage. Move ScaleMode to layout package. Add MediaContainerUIComponent sample project to show how to use MediaContainer in Flex applications. This will replace the soon-to-be-defunct MediaPlayerWrapper project. Integrate sample apps with the API changes. Note that HelloWorld has been updated to use MediaContainer rather than MediaPlayerSprite, and is the best resource for seeing how to integrate a MediaContainer into an OSMF app.