Update to a newer a-frame that includes a fix for three.js culling issue

# Conflicts:
#	package.json
#	webpack.dev.js
#	yarn.lock

Basic AR support

# Conflicts:
#	package.json
#	src/room.js

Don't block connection on microphone, screen sharing permissions

Adding "network-counter" component- keeps track of networked entities and limits how many you can have, and how long they can live for.