Make FOV apply to the larger window dimension as discussed in #1591.
Remove the setter for .fovy on advice from @bagnell.
First draft implementation of pervertex normals for quantized-mesh.  Will need to update other meshes that use the CentralBody shaders.
Added new request headers to that specifies the content type as quantized-mesh or a quantized-mesh with vertex normals.  Added flags to CesiumTerrainProvider that specify (1) should the client request vertex normals and (2) does the server have vertex normals.
Minor cleanup.
If no vertex normals are in the mesh, then do not add junk normal data to the vertex buffer.  Fixed Globe shader so that day-night shading can be used again.
Updated hasWaterMask and hasVertexNormals to be properties.
Added unit test to load QuantizedMeshTerrainData with VertexNormals.
Added unit test to test rendering of quantized-mesh terrain with lighting enabled.
Merge remote-tracking branch 'agi/master' into quantizedmeshVertexNormals
cleanup PolylinePipeline
simple polyline WIP
Merge remote-tracking branch 'agi/master' into quantizedmeshVertexNormals
simple polyline
cleanup simple polyline
Merge branch 'master' into polylineArc
PolylineGeometry
cleanup tests
jazz up sandcastle examples
fix heights
Merge branch 'master' into polylineArc