Assimp importer now sets the collada options to fix up axis transformation
bounds are now created by tsmesh
top level nodes are now added to the processNodes stack so bounds and other root nodes can be found correctly
The lodType, singleDetailSize, adjustCenter and adjustFloor options been added to the importer.
Implementation of $Assimp::FlipNormals has been fixed.
$Assimp::FlipWindingOrder has been added to expose aiProcess_FlipWindingOrder.
Logging is now enabled and directed to assimp.log.