Added several geometry types (box, polygon, polygon outline, circle) with support for many properties including extrusion; expanded many other APIs. Some Cesium samples on the website are using undocumented APIs, so I added a conveniencee GWT object "Undocumented" that allows you to get and set properties in accordance with the samples without necessarily hardcoding in support for these features. Added support for object picking, double click handling, color enums, and other improvements.