switch travis to use firefox aurora
switch travis to use firefox aurora

dmarcos/aframe,msimpson/aframe,mkungla/aframe,RSpace/aframe,MatthewShotton/aframe,RSpace/aframe,aframevr/aframe,wizgrav/aframe,weddingdj/aframe,jaxmolina/ar,MatthewShotton/aframe,aframevr/aframe,ngokevin/aframe,darkwing/aframe,fernandojsg/aframe,jzitelli/aframe,jzitelli/aframe,fernandojsg/aframe,jaxmolina/ar,googlecreativelab/aframe,dmarcos/aframe,chenzlabs/aframe,chenzlabs/aframe,darkwing/aframe,wizgrav/aframe,msimpson/aframe,ngokevin/aframe,googlecreativelab/aframe,mkungla/aframe,weddingdj/aframe