Setting focusIndex won't work in md-tab-group

[marc-ferrer]

Bug, feature request, or proposal:

Can't bind to 'focusIndex' since it isn't a known property of 'md-tab-group'.

What is the expected behavior?

md-tab-group should accept focusIndex property.

What is the current behavior?

Adding focusIndex property to md-tab-group causes an unhandled promise rejection.

What are the steps to reproduce?

http://plnkr.co/edit/h7d6DDvqRFCfmChp7Qvj

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

focusIndex property should works as expected.

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

Tested with angular 2.0.0-rc.5 and Material 2.0.0-alpha.7-4

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