OSMF SVN

Add sample plugin and app to demonstrate use of resource-level metadata to allow a plugin to create media for a resource that would otherwise be handled by a core MediaInfo.

Fix ListenerProxyElement unit tests.

Update example that uses proxy to trace all events to use ListenerProxyElement.

Update terminology in readme file.

PARB feedback: Rename playhead to currentTime, bytesDownloaded to bytesLoaded. Affects traits, MediaPlayer, and events. Updated dependent unit tests and sample apps.

This is an empty revision for padding.

PARB feedback: Refactor MediaPlayerState to convert constants to strings. Remove all other methods. Update dependent code.

PARB feedback: Refactor StreamType to convert constants to strings. Remove all other methods. Update dependent code.

PARB feedback: Refactor ScaleMode to convert constants to strings. Move utility function into dedicated utility class (ScaleModeUtils). Remove all other methods. Update dependent code.

PARB feedback: Refactor our DynamicStreamingResource class (and hierarchy). Introduce StreamingURLResource and StreamType to lay groundwork for live support. Fix some bugs related to seek not working when a duration is unspecified (NaN). Further refactor unit tests to make them toggleable between hitting the network and using mock objects (still a few tests that fail against the network).