title: Marionette way to Live form validation
body: <p>What is that Marionette way to live (i.e. on every key press) form validation? I mean both two cases - on client-side and - at rare case - via ajax with deffereds. </p>
  
  <p>We already have model's validation. So, the situation has Backbone/Marionette specifics, if we want to use model's validation for client-side live form validation also.</p>