Support new notification

Replace ```webkitNotification``` APIs with ```Notification```.

The old ```webkitNotification``` API is deprecated and abolished in Chrome 35.
So I alter codes using ```webkitNotification``` to use  new ```Notification``` APIs.
(I also update Modernizr 2.6.2 -> 2.8.2 because 2.6.2 does not support ```Notification``` ) 

It's will support Chrome 22+ and Firefox 22+.