[feature request] Select md-tab-group by highlighting and pressing space key

[msc117]

Bug, feature request, or proposal:

feature request

What is the expected behavior?

Highlighted tab is selectable by both enter and space key

What is the current behavior?

Only enter key

What are the steps to reproduce?

Create tab group, focus a tab, press space
http://plnkr.co/edit/kLMZ6Oe67mmTXx6TAY34?p=info

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

This behavior is used throughout other components and fairly standard to select highlighted option through space or enter

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

2.0.0-beta.8

Is there anything else we should know?

I can self assign and do this myself if not being worked on already

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