Package mdc-drawer missing export 'util'

[pgbross]

What MDC-Web Version are you using?

0.7.0

What browser(s) is this bug affecting?

Version 58.0.3029.19 beta (64-bit)

What OS are you using?

Fedora 25 (Linux p5q 4.9.13-201.fc25.x86_64)

What are the steps to reproduce the bug?

1. Write a framework example, such as vue/src/v-mdc-drawer/TemporaryDrawer.vue
2. import { MDCTemporaryDrawerFoundation, util } from '@material/drawer';
3. Use the component and observe that util is undefined.

What is the expected behavior?

The mdc-drawer util methods should be available for users of the @material/drawer package (from the dist/mdc.drawer.js code) without having to import util from the node_modules folder separately. Note this change is also needed when no module system is used under the global mdc namespace where there is no workaround.

What is the actual behavior?

The util methods are unavailable and need to be imported separately when writing, say, a framework integration example.

Any other information you believe would be useful?

The mdc-dialog package does this correctly by including:

import * as util from './util';
export{util};

in its index.js file, and the same should be done in mdc-drawer/index.js.