Adds change method, disables turbolinks

Disabling turbolinks prevents errors in the console when turbolinks (default in rails4) is used. If you don't feel it's appropriate to add that, I can remove it.

More info here: https://github.com/rails/turbolinks/

The change method allows a pager to have it's page changed via JS. This is useful when you have multiple pagers on a page and want to keep them in sync. The callback, if supplied, is not called when change is invoked.