Accelerometer

Completed HTML AccelerometerMotionEvent, formerly AccelerometerMotion. Also renamed AccelerometerOrientation to AccelerometerOrientationEvent. Currently these events are both persistent (they are not re-instantiated per emit), so if stored, they will have different values if used later on.

Found there is not yet support for DeviceMotionEvent in Chrome, but will be soon: https://code.google.com/p/chromium/issues/detail?id=135804

Was not able to test AccelerometerMotionEvent @-180 window orientation, because no platform currently supports both.

Next will be trying to get Air to behave similarly.