[slider,tab @alpha.9-3] slider cannot be used within tab (verbose API)

[RoxKilly]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

MdSlider should work within tabs

What is the current behavior?

When a slider is used within a tab that uses the verbose API

• Slider value is set to max allowed as soon as slider receives focus
• thumbtack cannot be moved
• slider value remains at max indefinitely

What are the steps to reproduce?

Just put a slider within a tab (see this plunk):

<md-tab-group>
  <md-tab>
     <template md-tab-label>Tab</template>
     <template md-tab-content>	    
          <md-slider min="0" max="20"></md-slider>                
     </template>
  </md-tab>
</md-tab-group>

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

bug-fixing

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

Angular 2.0.1, Material 2 alpha 9-3

Is there anything else we should know?

I have not tested the compact tab-group API

[mmalerba]

duplicate of #1389

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