title: Laravel 4 Validation unique(database) ignore current
body: <p>I'm doing validation on a users edit form and have the validation checking if the username is unique in the database or not.</p>
  
  <p>However when the editing a user and you don't change the username field it's still checking if the field is unique or not...</p>
  
  <p>Is there a laravel way to ignore the current username if not changed? </p>