Fixed adding a previous removed object to the scene. (webglobject.__webglActive == null taken out and fixed)
Merge pull request #25 from tiagocardoso/remove_add_fix

Fixed adding a previous removed object to the scene.
Update for Dart 0.2.8.2 SDK.
Merge pull request #26 from dgrove/master

Update to Dart SDK 0.2.8.2
Cleanup
pubspec rob email updated