[MdButton] styles get messed up

[eagle-dan1349]

Bug, feature request, or proposal:

[x] Bug

What is the expected behavior?

MdButton behavior is indifferent to hosting element, be it or

What is the current behavior?

When using 'md-button' on element, it attaches 'disabled' attribute.
Presence of 'disabled' attribute causes disabled state styles to be applied to button (no matter what is attribute's value).
In case of

tag, everything is fine

What are the steps to reproduce?

Create a page with link
Use md-button on it.
See styles broken.

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

Stable and consistent behavior of component.

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

Angular 2.2.4
Material 2.0.0-alpha.10

[fxck]

#1946

[eagle-dan1349]

I used usual 'md-button', not 'md-raised-button'

[jelbourn]

Dupe of #1946 (applies to all kinds of button)

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}