Invalid md-datepicker does not invalidate form

[laberle]

Using md-min-date and md-max-date disallow picking dates when using the datepicker, but typing an invalid date into the input box does not invalidate the form.

Basically just used the demo code and added a button.
Codepen: http://codepen.io/anon/pen/xwaJvQ

<md-content>
    <form name="myForm">
      <md-datepicker name="dateField" ng-model="myDate" 
        required="true"
        md-min-date="minDate" 
        md-max-date="maxDate">
      </md-datepicker>     
      <md-button class="md-raised" ng-disabled="myForm.$invalid">Submit Form</md-button>
    </form>
  </md-content>

[ngraef]

Duplicate of #4926. This is fixed in v1.0.0-rc3 and master.

[jelbourn]

Thanks for the dupe reference!