Fixed endianess of VertexNormal extension size.
Delimit extensions with a hyphen in the accept header.
Merge remote-tracking branch 'agi/master' into quantizedMeshExtensionsFix
Added a comment to explain the workaround for switching to octvertexnormals.
Merge pull request #2291 from abwood/quantizedMeshExtensionsFix

Quantized mesh extensions fix