Trigger an event whenever a call is completed.

[lopis]

I would be useful to know when a include has finished loading and is ready for instance to be used in Javascript.

[donaldinou]

I made substantially the same, so I only can approve this.
My application need to bind some event on dom element after an ajax request. I think that several modern application need that kind of stuff

[mnot]

If someone wants to pick it up, see #42

[mnot]

Work progressing in #44

[mnot]

See #50.