docs(demo): add es6-shim
docs(demo): add es6-shim

mattlewis92/angular2-calendar,SamindaK/angular-calendar,juanfc/angular-calendar,mattlewis92/angular-calendar,mattlewis92/angular2-calendar,mattlewis92/angular2-calendar,SamindaK/angular-calendar,juanfc/angular-calendar,mattlewis92/angular-calendar,SamindaK/angular-calendar,juanfc/angular-calendar,juanfc/angular-calendar,mattlewis92/angular-calendar,mattlewis92/angular-calendar