autoVR for renderer and controller - switching normal mode and VR mode.

Maybe we can make GLAM VR mode works like [webvr-boilerplate](https://github.com/borismus/webvr-boilerplate). 

It can switch between normal mode and vr mode depends when clicking the icon.
Is it a good idea to implement this and is `autoVR` is a good name?

``` html
<renderer type="autoVR"></renderer>
<controller type="autoVR"></controller> 
```
