transfer features from cg2sandbox
* add axis aligned bounding box
* add lazzy camera
* add navigation math
* rename trackball
* add world-in-hand navigation
Merge branch 'master' of https://github.com/hpicgs/glow.git
apply cg2sandbox shader fix (mac issue)
During refactoring towards Shared Data (refs #51)
Merge branch 'master' into shared_data_abstraction