initial support  for GUI nodes
work on gui nodes
added some minor API changes
fix bug with importing mesh that does not have UVs
re work loading such that the Requrie.js loader can do a better job of optimizing. Move main load logic into load.js. This will make the system bootstrap take only 18 requests when uses with the -compile option
Merge branch 'GUINodes' of https://github.com/adlnet/Sandbox into GUINodes
merge up development
fix for significant problems with the scenemanager resulting from the the collada loader adding meshes as children of other meshes