Build with the latest version of Node 4.x instead of 4.3
Build with the latest version of Node 4.x instead of 4.3

`eslint` or one of the modules it depends on does not work on 4.3 (we
should have always just been using `4` instead of `4.3` to begin with.)

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