OSMF SVN

Adding unit tests for ContentDownloadableTrait.

Removing 'libs' as a library path from the Flex Builder project properties.

PARB feedback: Consolidate/rename MediaPlayerState enumeration:
* CONSTRUCTED -> UNINITIALIZED
* INITIALIZED -> READY
* SEEKING -> BUFFERING (since any delay caused by a seek is due to the need to buffer data)

Moved the VideoElement DRM specific tests into the 10.1 block.

updated the unit tests for the DRM subsystem. Still lacking tests for Authentication Token.

PARB feedback: Add MediaPlayer.stop method. Rename MediaPlayer.source to MediaPlayer.element.

Minor code cleanup.

PARB feedback: Change ScaleMode.CROP to ZOOM.

Update readme.txt for PluginSample project.

Updated a couple of imports that escaped the 10.1 conditional clause.