do not set `parentNode` -- it's a read-only property
do not set `parentNode` -- it's a read-only property

we noticed this after getting errors when running babel on
a-frame (which we had to do since it now uses some features
that uglify does not support)

dmarcos/aframe,ngokevin/aframe,aframevr/aframe,ngokevin/aframe,chenzlabs/aframe,RSpace/aframe,RSpace/aframe,chenzlabs/aframe,mkungla/aframe,mkungla/aframe,dmarcos/aframe,aframevr/aframe