Quick clicks crash/lock-up snack-bar

[JanStureNielsen]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Fast clicks on snackbar should not crash/lock-up the component.

What is the current behavior?

If you click the snackbar quickly, say five times, the snackbar becomes unresponsive and it stays visible. A refresh is required to reset the component.

What are the steps to reproduce?

https://material.angular.io/components/component/snack-bar

Click "SHOW SNACK-BAR" button five times as quickly as possible.

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

POLA :-)

Which versions of Angular, Material, OS, browsers are affected?

"@angular/common": "2.4.5",
"@angular/compiler": "2.4.5",
"@angular/compiler-cli": "2.4.5",
"@angular/core": "2.4.5",
"@angular/forms": "2.4.5",
"@angular/http": "2.4.5",
"@angular/material": "2.0.0-beta.1",
"@angular/platform-browser": "2.4.5",
"@angular/platform-browser-dynamic": "2.4.5",
"@angular/router": "3.4.5",

Fails on Chrome/Linux, Chrome/Mac, Firefox/Linux -- likely all browsers.

Is there anything else we should know?

We are enjoying Angular and Material!

[JanStureNielsen]

Duplicate of #2390 and #2877 and fix PR #2392.

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