Clean up test code.
Clean up test code.

Use CzmlDataSource.load in most tests. Compare against the values from the packet data rather than copy/pasting the expected values.

likangning93/cesium,YonatanKra/cesium,jasonbeverage/cesium,YonatanKra/cesium,progsung/cesium,CesiumGS/cesium,YonatanKra/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,likangning93/cesium,CesiumGS/cesium,CesiumGS/cesium,YonatanKra/cesium,progsung/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,jasonbeverage/cesium,CesiumGS/cesium