button-toggle and radio conflict with each other

[thunderrun]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When <md-button-toggle> is toggled, <md-radio-button> should keep the selection and vice versa.

What is the current behavior?

When <md-button-toggle> is toggled, <md-radio-button> get deselected and vice versa.

What are the steps to reproduce?

http://plnkr.co/edit/966VCLoOZIfs5nTsb169?p=preview

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

Angular 2.2.3
Material 2.0.0-alpha.11-3
OS windows 10
browser Chrome

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