Add quantized-mesh MIME type
Add quantized-mesh MIME type

Running our unit tests under IIS would fail because the test terrain tiles
could not be served. Fixes #2651

geoscan/cesium,kiselev-dv/cesium,esraerik/cesium,soceur/cesium,YonatanKra/cesium,esraerik/cesium,denverpierce/cesium,AnimatedRNG/cesium,ggetz/cesium,soceur/cesium,CesiumGS/cesium,geoscan/cesium,aelatgt/cesium,emackey/cesium,likangning93/cesium,denverpierce/cesium,emackey/cesium,wallw-bits/cesium,jason-crow/cesium,jasonbeverage/cesium,omh1280/cesium,esraerik/cesium,AnimatedRNG/cesium,YonatanKra/cesium,likangning93/cesium,jason-crow/cesium,emackey/cesium,ggetz/cesium,progsung/cesium,hodbauer/cesium,emackey/cesium,josh-bernstein/cesium,kaktus40/cesium,oterral/cesium,hodbauer/cesium,jason-crow/cesium,ggetz/cesium,likangning93/cesium,wallw-bits/cesium,esraerik/cesium,likangning93/cesium,YonatanKra/cesium,omh1280/cesium,NaderCHASER/cesium,omh1280/cesium,progsung/cesium,oterral/cesium,NaderCHASER/cesium,CesiumGS/cesium,ggetz/cesium,NaderCHASER/cesium,AnimatedRNG/cesium,aelatgt/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,josh-bernstein/cesium,denverpierce/cesium,kiselev-dv/cesium,aelatgt/cesium,aelatgt/cesium,omh1280/cesium,denverpierce/cesium,wallw-bits/cesium,YonatanKra/cesium,jasonbeverage/cesium,jason-crow/cesium,AnimatedRNG/cesium,hodbauer/cesium,oterral/cesium,wallw-bits/cesium,CesiumGS/cesium,kaktus40/cesium,AnalyticalGraphicsInc/cesium,soceur/cesium,CesiumGS/cesium,kiselev-dv/cesium,likangning93/cesium,kiselev-dv/cesium