title: Backbone Validation Add inputs to validation
body: <p>I have one backbone model that includes validation object with list of validation parameters.</p>
  
  <pre><code>var SignUpModel = Backbone.Model.extend({    
    validation: {    
      firstname: {
          required: true,
           pattern: 'name'
      },
      lastname: {
          required: true,
          pattern: 'name'
      }    
    },
  
    addToValidation: function(){         
       // HOW TO DO THIS???
       this.validation.PUSH{
        country: {
           required: true
        },
        phone: {
          required: true,
          pattern: 'phone'
        }
      }
    }    
  });
  </code></pre>
  
  <p>How to add to this object another object? I didn't find it in JS, but maybe this function exists in Backbone or Underscore?</p>
  
  <p>Also maybe backbone has special thing for data keeping?</p>