Relax access control for load (so we can show mturkers the scenes).
Factored out scene serialization into PackedModelsSceneLoader.js
Update gl_app code to use PackedModelsSceneLoader
Remove UndoStack from ModelInstance to temporarily fix circular dependency
Fix UndoStack issues and decouple from CMDTYPE definition
Generalize SceneLoader interface
Add stub for SSJ SceneLoader
Hook up new SSJ format Scene serialization
Fix some Camera loading issues
Fix for old SceneStudio scenes with wrong parentMeshI's
Some more fixes for UndoStack
Remove old camera saving code
Lazy loading of scene preview images.
Add appropriate prefix to preview images when lazy loading.
Lazy loading of images for experiment results.
Bar chart for mturk stats.
Charts showing how many items were completed.
Add links to our new charts.
Add buttons for exporting to CSV.
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