add minimal-ui to `meta[name=viewport]` for iOS 7 (fixes #1234)
add minimal-ui to `meta[name=viewport]` for iOS 7 (fixes #1234)

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