Request events should also get called on the Client object too

[matryer]

Use case:

As a developer
I want to add a 'loading' animated gif to the page whenever Stretchr is doing some work
So that I can inform the users of activity, and ask them to wait

Ideally, like this:

stretchr.before(function(){
  $("#busy").show();
});
stretchr.after(function(){
  $("#busy").hide();
});

Where #busy could be a div that fills the screen and has a "Please wait..." message on it.

At the moment, request events don't get called on the Stretchr.Client.

[mazondo]

This is pretty cool. Probably not super high on the priorities but definitely a nice to have