#69 Add callback function to remote chained.

[hkirsman]

Would still need compiling into min and probably also this change: 2f68092

Using it something like this:

var setDefaultFromUrl = function(select) {
  console.log('executed');
};

$("#all-downloads-service-pack").remoteChained({
  parents : "#all-downloads-version",
  url : '/service-pack',
  callback: setDefaultFromUrl
});