* Rewrote J3M loader
* AssetManager.unregisterLocator() must be implemented
* Added support for material default vars
* Apply NVIDIA spot light fix for TerrainLighting
git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8024 75d07b2b-3a1a-0410-a2c5-0572b91ccdca