title: Laravel session flash message appears multiple times on pageback
body: <p>In my controller:</p>
  
  <pre><code> Session::flash('created', "Student created");
   return Redirect::to('student');
  </code></pre>
  
  <p>In my view:</p>
  
  <pre><code> @if(Session::has('created'))
   alert('updated');
   @endif
  </code></pre>