[md-slider @alpha 7-3] Change detection not working

[RoxKilly]

Bug, feature request, or proposal:

Bug I think.

What is the expected behavior?

When the slider value changes, it should emit a (change) event the way the native input range does

What is the current behavior?

Moving the md-slider does not emit the (change) event

What are the steps to reproduce?

• Open this plunker
• Move both the md-slider and the native input range. Notice that only the latter's changes trigger updates to the view

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

Since md-slider functionally replaces the native input type='range', I would expect their behaviors to be compatible

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

Angular 2 rc.5 with Material 2 alpha 7-3

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