Added cesium Event class and ability to listen to Scene morph events. Fixed poor initial implementation of JsFunction properties, which probably never worked before.  Properties are now added to the correct JavaScript object. These changes allowed me to implement a cesiumWidget "player" panel with cesiumWidget that can manage its own render loop and pause the rendering when inactive (saves CPU churn significantly).
added comment, hints for Event.java
deleted files checked in by accident (META-INF)
Merge branch 'master' of https://github.com/richkadel/cesium-gwt