Merged in a pull request to enable the alpha channel for the scene

https://github.com/AnalyticalGraphicsInc/cesium/pull/841/files

original post from the google cesium-dev group

https://groups.google.com/forum/?fromgroups#!topic/cesium-dev/brrVOnspM3s
Added canvasOptions to the CesiumWidget constructor
Changed the folder name for the additional cesium files
Added a reference to the cesium model
Removed the old reference to the cesiumInstance, use the cesium.vwf.yaml component now
Skip the prototypes
Updates to get the billboards working