md-ink-bar not visible using <nav md-tab-nav-bar>

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Bug, feature request, or proposal:

Bug

What is the expected behavior?

md-ink-bar should be visible

What is the current behavior?

md-ink-bar is not visible

What are the steps to reproduce?

http://plnkr.co/edit/qXJdsDIr5pwXxCdbRyLL

The plunker includes a simple example, however I could not get the router to work correctly, because I am not familiar with plunker.

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

<nav md-tab-nav-bar> should yield the same presentation as <md-tab-group>

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

Tested on angular 2.3 and 2.4, material2 2.0.0-beta.1, Chrome v56

Is there anything else we should know?

nope

[andrewseguin]

This should be fixed by #3041

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