feat(slide-toggle): remove Hammer.js dependency

[crisbeto]

Removes the slide toggle's dependency on Hammer.js by getting rid of the dragging gestures.

[jelbourn]

How much work do you think it would be to use the same code for the slider and the slide-toggle to still support dragging the toggle?

[crisbeto]

It won't be that much work, but it also won't be too much code that'll be shared. Most of it is normalizing mouse and touch events, and making sure that events are cleaned up correctly, everything else is component-specific code. That being said, I decided to remove the sliding gesture here because:

1. I'm not sure it's that useful. The component is narrow enough (36px) that dragging on it pretty much constitutes a click already. We even had a bit of logic trying to distinguish a drag from a click so we don't fire the same events twice.
2. We've already removed it from the MDC version and MDC don't implement it themselves.

[jelbourn]

That's fair- we can see how the presubmit goes and if anyone complains.

[jelbourn]

LGTM

[devversion]

LGTM

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