MdDialog will stack on top of each other if enter key is continually pressed

[kylecannon]

Bug, feature request, or proposal:

Dialogs will stack on top of each other if you press enter repeatedly

What is the expected behavior?

focus should be lost on the button opening the dialog after the dialog is opened.

What is the current behavior?

Dialogs continue to stack

What are the steps to reproduce?

1. Go to Material's Dialog Page
2. Press "Open dialog"
3. After dialog is open, continue hitting enter to eventually see the overlay of the dialog to turn to black

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

Focus shouldn't be on the button that was clicked to open anymore.

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

Tested to happen on chrome 59 on material.angular.io site.

Is there anything else we should know?

If this is expected behavior, there should be a configurable option to disable this.

[kylecannon]

Thank you for the quick turn around @crisbeto and @kara

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