remove submodule of paper
fix polymer version

http://stackoverflow.com/questions/27349870/could-not-find-asset-web-componentslib-webcomponents-js
remove
refactor
fix an error on dartium

http://stackoverflow.com/a/24664925/1085087

Exception: NoSuchMethodError: method not found: 'whenPolymerReady'
Receiver: Instance of 'JsFunction'
Arguments: [Closure: () => dynamic] package:polymer/src/loader.dart:105_hookJsPolymer@692536198 package:polymer/src/loader.dart:105startPolymer package:polymer/src/loader.dart:56initPolymer package:polymer/src/loader.dart:34main main.dart:18main index.html_bootstrap.dart:15
Merge pull request #4 from MiCHiLU/remove-paper

Remove paper