One ripple to rule them all.
Refactors buttons, FABs, radio buttons and checkboxes to all use the same ripples.
Also simplifies adding ripples to components by specifying the RippleEffect class (which is now required for checkboxes and radio buttons as well, which will otherwise not have ripples).
Merge pull request #501 from sgomes/material-sprint-one-ripple

One ripple to rule them all.