Added Polymer 0.5.4

polymer_0.5.4/bower_components/paper-dropdown/paper-dropdown-transition.html

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 <!--
 
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         } else {
           this.fire('core-transitionend', this, node);
         }
       },
 
     });
   </script>
 </polymer-element>
 
 <paper-dropdown-transition id="paper-dropdown-transition"></paper-dropdown-transition>