Be sure to mention that this expects a POST and a request body of "{ model: ..., make: ..., year: ...}"

Show some example client code on how to call it.  JS?

```js
StackMob.customcode('CRUD_Create', 'POST', 
{ model: 'a', make: 'b', year: 'c' }, { success: function(result) { ...} })
```