CRUD create action should publish entity id after save

[AMcBain]

The CRUD controller should publish the id of the newly saved entities to the "params" variable. This is a small difference that goes a long way toward helping out @after annotations on CRUD controller subclasses handle both created and existing entities the same. As it is now, there is no way to get a saved entity if it is newly created.

Use-cases for this wrt @after allow for a nice "post save" hook that is valid for FileAttachments. Using JPA's @Post[\w]+ annotations or overriding the save method on models and calling super give the /tmp path for FileAttachments and this isn't usable since they will be shortly moved to the "attachments" directory.