Fix transforms

[kcoley]

0.1.1 (2018-10-21)

Fixed Bugs:

• Fixed issue with node transforms and node animations, where the glTF node transform would get applied on top of its animation, causing incorrect positions.

  Changes:

• Convert usd file path to absolute path on load
• Reformatted changelog
• Switched some methods to properties
• Increment version

[wave-electron]

@kcoley Well done. I reverted back to the older version the past couple weeks because I was having less animation problems than with the newer version. But now your fixed some of these animation issues I will go back to new version & test it out again for any animation bugs.