Check triangleIndices

[kylebarron]

This is decoded with quantized-mesh-decoder in js:

The triangleIndices looks a little suspect. Especially since there are two zeros in a row.

[kylebarron]

Could be related to #11 , where the tile is essentially flipped

[kylebarron]

The tile being flipped was I believe a result of triangle indices being clockwise instead of counter clockwise. That's being tracked in #13.