Initial WebVR API integration.

- Remove ThreeJS Oculus effect.
- Remove websocket RiftClient
- Add WebVR device manager.
- Integrate WebVR sensorDevice into RiftSketch.
Implement WebVR fullscreen.
Hacked together to get the code editor working.
Add keyboard shortcuts, non-vr mode.
Add editor increment/decrement. CSS position.

Also change example code.