feat(fab): Basic color

[infacto]

Feature Description

Allow basic color for FABs too. Not only for the default buttons.

https://material.angular.io/components/button/overview

Use Case

Update:

The following works:

<button mat-fab color="basic">
  <mat-icon>home</mat-icon>
</button>

The other buttons uses basic color, when no color attribute is set. The FAB uses accent (or primary) as fallback.

[amysorto]

The material design spec specifies that FABs should be contrasting from the background, so I'll close this bug.

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