fix events to bubble by default (for MozVR/aframe#212)
fix events to bubble by default (for MozVR/aframe#212)

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