Fix blend shapes

[kcoley]

0.2.0 (2019-02-27)

Fixed Bugs:

• Fix blend shapes Changes:
• The Usd file generation now happens in a temp directory
• Add --scale-texture optional parameter to multiply metallic/roughness factors by textures
• Added creator metadata
• Moved material scope to below root xform
• connect opacity of diffuse texture if alpha blend or mask is used
• Export extras data on nodes and glTF asset

[wave-electron]

Cool nice work