support mini sidenav

[farley911]

Bug, feature request, or proposal:

Add support to display a mini version of the sidebar instead of completely closing it

What is the expected behavior?

When the sidenav is toggled instead of setting visibility to hidden and completely hiding it allow the developer to provide a min-width that remains visible.

What is the current behavior?

When the sidenav is toggled it is completely removed from the UI.

What are the steps to reproduce?

Create a sidenav and toggle it closed.

Providing a Plunker (or similar) is the best way to get the team to see your issue.
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What is the use-case or motivation for changing an existing behavior?

To support the mini sidenav functionality provided in Angular Material 1

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

Angular 4.0.0 | Angular Material 2.0.0-beta.3, All OS, All Browsers

Is there anything else we should know?

n/a

[jelbourn]

@mmalerba do we already have an issue for this?

[haskelcurry]

Any updates on this?

[willshowell]

Sounds like a dupe of #1728

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