md-button-toggle-group with vertical aligned md-button-toggle

[Borki]

Bug, feature request, or proposal:

Request, Proposal

What is the expected behavior?

That i can build a md-button-toggle-group in which all md-button-toggle are vertical aligned.

What is the current behavior?

All md-button-toggle in a md-button-toggle-group are horizontal aligned

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

I want to make a md-button-toggle-group in which the goggle buttons are vertical assigned for example for side-nav bars. maybe an new value like multiple (vertical/horizontal)

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

"@angular/core": "~2.1.0",
"@angular/material": "2.0.0-alpha.10"

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