Bug preventing .sprite files from loading when referenced in .scene file

node board
{
    sprite = res/example.sprite
    translate = 0, 1, 0
}

would fail at loading the referenced sprite file because supportsUrl (4th parameter) was set to false in addSceneNodeProperty in SceneLoader
 
Plus I found a memory leak, forgot to release the custom effect when passing to SpriteBatch where another reference is created when material is made.