fix(ripple): Export getMatchesProperty

[codesuki]

This will be useful to keep browser compatibility for people implementing components using ripple.

[traviskaufman]

Thanks for taking the initiative on this! I agree that it could be useful.

However, if we're going to export this, we should probably put it in util.js within mdc-ripple and write some tests for it.

[traviskaufman]

Actually, it looks like we already do export this within our util.js class (sorry, been a minute since I looked at that code specifically). Could you not just import @material/ripple/util and use it that way?

[codesuki]

You are right. It is already exported. I got confused because in the react example I used
import {MDCRipple, MDCRippleFoundation} from '@material/ripple/dist/mdc.ripple';.

I tried it again and reproduced the error I had.

In line with the current sample I used the compiled .js file from dist/ which does not contain getMatchesProperty.
If I try to import from @material/ripple I get the following compile error:

Uncaught SyntaxError: Unexpected token import

ripple/index.js

import {MDCComponent} from '@material/base'; <--- 

So maybe it's a webpack configuration issue.

In my private project I actually am using this successfully

import { getMatchesProperty } from '@material/ripple/util';```

This pullreq. can be closed, sorry.