Only button toggle is supported but not Icon toggle according to the specs

[richardsengers]

Bug, feature request, or proposal:

Feature request / Bug

What is the expected behavior?

Icon toggle with same behaviour as button-toggle according to the Specs
https://material.io/guidelines/components/buttons.html#buttons-toggle-buttons

What is the current behavior?

You can only set a button toggle and not an icon toggle

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

According to the specs an Icon toggle is part of the material design

Is there anything else we should know?

To me it looks like material2 is currently only supporting Button toggles, but no Icon toggles.
An example can be found here: http://mseemann.io/angular2-mdl/toggle
and is as simple as
<mdl-icon-toggle [(ngModel)]="checkbox1">format_bold</mdl-icon-toggle>

If this is already possible with material2 I would really like to know how ;-)

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