md-input ngControl attribute no longer works. since angular2-rc

[msegers]

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• Do you want to request a feature or report a bug?
  Bug
• What is the current behavior?
  Using an ngControl on md-input causes error:
  Error: Uncaught (in promise): No value accessor for 'username'
  when providing in template as:

<form #loginForm="ngForm" (submit)="onSubmit(loginForm.value)">
        <md-input ngControl="username" placeholder="user" ></md-input>
        <md-input ngControl="password" placeholder="pass" type="password"></md-input>
      <button md-raised-button color="primary" [disabled]="!loginForm.valid" type="submit">login</button>
    </form>

• If the current behavior is a bug,
  please provide steps to reproduce and if possible a minimal demo of the problem
  via https://plnkr.co or similar.
• What is the expected behavior?
  No errors shown, and works as normal input (changing md-input to normal input makes this functional again)
• What is the motivation / use case for changing the behavior?
  It seems to break every usage of ngControl on these inputs.
• Which version of Angular and Material, and which browser and OS does this issue affect?
  Did this work in previous versions of Angular / Material?
  Please also test with the latest stable and snapshot versions.
  I'm running the lastest config on webpack-angular2-starter, so the latest (alpha 4) material release and angular rc 1.
• Other information

[msegers]

Trying to set up a plnkr atm.

[msegers]

I was adding the FORM_DIRECTIVES from 'angular2/common';

That is wrong and that breaks stuff so no issue.

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