Removed RESOURCES_DONE event.

Since a Deferred is used to indicate when a playback has loaded, Playback does not need to fire a RESOURCES_DONE event, so the event has been removed. Tests have been changed accordingly. getSubStepEventId has also been renamed to getSubStepEventIndex to reflect what it really does in Playback.
Merge pull request #415 from chihuahua/graphicsReplayCodeInconsistencies

Removed RESOURCES_DONE event.