Re: [sensors] Provide the DeviceOrientation sensor

Those  ```void getQuaternion(Float32Array quaternion);``` should 
probably be called populate, if they just returned an object, it 
should just be a property. Making sure these works nicely with the 
popular glMatrix library would be nice, but they seem to. I am a big 
fan on these basically just being arrays. It should also be possible 
to easily construct a DOMMatrix from them.

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