npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.4.0/bower_components/paper-tabs/paper-tabs.html

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         s.left = this.selectedIndex * w + '%';
       } else if (cl.contains('contract')) {
         cl.remove('contract');
       }
     }
     
   });
   
 </script>
 </polymer-element>