title: How to make ngMessage for required fields only show when dirty or submitting a form?
body: <p>I'm using AngularJS 1.3.0 RC0 and angular-messages. ng-messages dutifully shows error messages for those "required" fields when a form is initially loaded and pristine. So the newly loaded form page is filled up with error messages. This is not what I want. How to make ngMessage for required fields only show when those fields are dirty or submitting a form? </p>
  
  <p>I have read the official doc, no clue. And tried to put "ng-show = "fieldName.$dirty"" in the ng-messages div, did not work. Any help would be highly appreciated!</p>