feature request(Snackbar): Give user feedback when pressing/clicking the action button

Bug, feature request, or proposal:

feature request (As there are no further instructions in the MD guidelines about it, I opened this as a feature request.)

What is the expected behavior?

There should be a feedback for the user when pressing or clicking the action button on a snackbar, e.g. a ripple effect on the button.

What is the current behavior?

There is no feedback when pressing or clicking the action button.

What are the steps to reproduce?

Just have a look on the demo snackbar from the documentation.

What is the use-case or motivation for changing an existing behavior?

To be in line with the MD guidelines.

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