Components: Make expansion panel height configurable

[jbojcic1]

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

Height of the md-expansion-panel-header should be configurable.

What is the current behavior?

Currently there is no way of doing it. I can only override it in css with important but then there is no animation.

What are the steps to reproduce?

Open material demo app and see expansion panel header.

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

Custom header height.

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

All

#### Is there anything else we should know?
-

[agustinhaller]

I'm facing the same issue, any news about this?

ref: https://github.com/angular/material2/blob/73c6d8d75712ed32cee2b624356d191662f2553e/src/lib/expansion/expansion-panel-header.ts#L67-L68

[TqrHsn]

gives:

gives:

unable to use this. Am I missing something?

[crisbeto]

Your first example is invalid @TqrHsn. You should use [expandedHeight]="'48px'" or expandedHeight="48px".

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