Alpha 10: Background for md-fab on <a> different then on <button>

[elvirdolic]

Bug, feature request, or proposal:

Bug?

What is the expected behavior?

if you use the md-fab directive on a button the primary background color is set if you use it on a link it'ts not

What is the current behavior?

Same behavior should be for as it is for

What are the steps to reproduce?

```
<a md-fab href="http://orderlink" target="_blank">
		<md-icon class="md-24">add_shopping_cart</md-icon>
	</a>

vs

	```
<button md-fab (click)="openUploadDocumentDialog()" [disabled]="dialogRef">
            <md-icon class="md-24">add</md-icon>
        </button>

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

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

Is there anything else we should know?

[crisbeto]

Could you post an example that shows the issue? I tried it locally with our demo app and they looked exactly the same.

[simonh1000]

I get the same with regular buttons:

<button md-raised-button color="accent" >Delete points</button>
<a [routerLink]="['upload']" md-raised-button color="accent">Return to Upload</a>

[crisbeto]

Weird @simonh1000, here's what I get against master with the exact same HTML (obviously the color will be different):

[kyleledbetter]

sounds like a dup of #1801 which has an unreleased fix in master #1789

[elvirdolic]

Yes this solves the issue #1789

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