MD-TAB does not support [disabled] property

[sinisarudan]

Bug, feature request, or proposal:

MD-TAB does not support [disabled] property
https://github.com/angular/material2/tree/master/src/components/tabs

What is the expected behavior?

for the code

<md-tab-group>
    <md-tab [disabled]="true"></md-tab>
    <md-tab></md-tab>
</md-tab-group>

the first tab should be disabled

What is the current behavior?

both tabs are enabled, operational

What are the steps to reproduce?

create a code like this:

<md-tab-group>
    <md-tab [disabled]="true"></md-tab>
    <md-tab></md-tab>
</md-tab-group>

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

in Angular Material 1 it is functional:
https://material.angularjs.org/latest/demo/tabs

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

Is there anything else we should know?

[robertmesserle]

Duplicate of #645.

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