model override should work for create and update not just findone and findall

[ccummings]

When I override the model structure, this works fine for findone and findall, however it does not apply to create and update which I then have to manually process when the newly created model instance is returned.

ie. I create an object where the object is nested {note: {id:4}}
When the response on successful create comes back it is also nested by my overridden model is not applied.

In case this is relevant, my experience is with the MooTools version of canjs.

[tracer99]

Conversation in Forums about this issue: https://forum.javascriptmvc.com/#Topic/32525000001090143

[justinbmeyer]

This breaks some other things, specifically around what goes in the model store. The model function does not simply "unbox" the response data, it put things in the store. I'm going to fix this.

[justinbmeyer]

This rears it's ugly head again with #560 and #561.

This needs to be fixed, but might require some breaking API changes.