feat(ripple): support multi-touch

[crisbeto]

Currently when using multi-touch on a ripple trigger, the ripple will keep firing from the first touch position (e.g. putting one finger down and then tapping with another). These changes will fire off a ripple for each individual touch.

[devversion]

I'm not sure whether this is the desired behavior. By looking at the Android ripples (which are primarily for touch), only the first ripple seems to be launched.

[crisbeto]

I'm open towards changing it so no new ripples are fired until you've lifted your finger, but I thought that the point of the ripples was to get feedback whenever you've touched something.

[devversion]

I agree with the ripples being more a feedback if someone touched something. That's what I also wrote to the ripples.md file. Since the subsequent touches are still interacting with the element, there should be some feedback.

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