Added texture rotation check to KML ground overlay rotation unit test.
Added texture rotation check to KML ground overlay rotation unit test.

ggetz/cesium,kaktus40/cesium,wallw-bits/cesium,jasonbeverage/cesium,NaderCHASER/cesium,CesiumGS/cesium,CesiumGS/cesium,oterral/cesium,likangning93/cesium,emackey/cesium,ggetz/cesium,josh-bernstein/cesium,wallw-bits/cesium,NaderCHASER/cesium,CesiumGS/cesium,progsung/cesium,geoscan/cesium,hodbauer/cesium,progsung/cesium,josh-bernstein/cesium,YonatanKra/cesium,hodbauer/cesium,oterral/cesium,kaktus40/cesium,NaderCHASER/cesium,geoscan/cesium,soceur/cesium,CesiumGS/cesium,ggetz/cesium,soceur/cesium,hodbauer/cesium,wallw-bits/cesium,emackey/cesium,likangning93/cesium,ggetz/cesium,emackey/cesium,soceur/cesium,wallw-bits/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,YonatanKra/cesium,emackey/cesium,jasonbeverage/cesium,YonatanKra/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,oterral/cesium,YonatanKra/cesium,CesiumGS/cesium,likangning93/cesium