Only import lodash.merge instead of full library

Fixes for shape components sometimes erroring.

cardboard support for cursor-controller

fix/navmesh_teleport

fix expiry date for Chrome Origin-Trial token (see issue #320)

handle playback of background video when page loses focus (fixes issue #310)

add `crossorigin="anonymous"` attributes to cross-origin images in `<a-assets>` (fixes issue #373)

remove unneeded `<p/>` in Privacy Notice

Some small UX fixes for the landing page and dialogs

Exit cleanly on blur

refactoring. Also making sure that navNode won't be null before clampStep if you try to teleport to an invalid (according to the navmesh) location.

Fix Oculus Browser timeout occuring in setup UI.

Oculus Go support (WIP)

Upgrade to lastest AFrame master

Added hack to exit scene when Oculus Go goes into standby. Clean up virtual gamepad controls on exit.

Fix for shape-component sometimes erroring. see: https://github.com/donmccurdy/aframe-physics-system/pull/94 and https://github.com/donmccurdy/aframe-physics-system/pull/95