removed webcomponents from dependencies

bower.json

@@ -27,8 +27,7 @@
     "extras",
     "test"
   ],
-  "dependencies": {
-    "polymer" : "Polymer/polymer#~0.5.3",
+  "devDependencies": {
     "y-test" : "y-test#~0.4.0"
   }
 }