Re: [w3c/gamepad] Added a supplemental "Extensions" spec (#32)

Related to the naming of "vibrate".  Would we want to also support haptics based on linear actuators or rotational torque through the same interface?

An example of a linear actuator is Apple's taptic engine.  In this case, instead of speed of rotation, you could apply a specific position to a weight to shift its center of gravity precisely.  Motion simulator chairs may also fall into this category.

An example of a rotational torque would be steering wheels.  In this case, a particular amount of torque is desired to pull the wheel away from its current position.

Linear actuators and rotational torque haptics may not be desired now, but perhaps we could ensure that names used in WebIDL and normative text can be generic enough that it won't make for awkward mappings in the future.  (eg. Use value instead of intensity, perhaps).

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