Fix "success" signature issue & added "sync" trigger

Hey Casey, I've been using your collection-crud and I noticed just a few needed changes.  Also I don't know coffeescript so i just edited your compiled JS script instead so hopefully if you approve, you can reverse engineer it.  Basically, for me it seemed like the options.success signature wasn't matching up with jQuery's success function.  If you look at the Backbone source, the success function under Backbone.Model just shows
```js
 options.success = function(resp) {
        model.attributes = attributes;
...
```
So I made the change there.  
Also i added a "sync" trigger similarly to the "save" to keep it all consistent.