MDButton inserting an div element under the button element after clicking on button

[HazizKhan]

After Clicking on button MDButton Inserting an div.md-ripple-foreground.md-ripple-fade-in element under the button.
take a look of these screenshots.

[crisbeto]

This looks like it should get sorted out with #1915

[jelbourn]

Dupe of #1818

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