code: function() {
          var ret = Ember.A();
          this.forEach(function(k) {
            if (indexOf(ret, k)<0) ret.push(k);
          });
          return ret;
        }
docs: Returns a new enumerable that contains only unique values. The default
  implementation returns an array regardless of the receiver type.
  
  ```javascript
  var arr = ["a", "a", "b", "b"];
  arr.uniq();  // ["a", "b"]
  ```
  
  @method uniq
  @return {Ember.Enumerable}