no migrations diff on template change

the generate-migrations-diff does not create migrations if the template changes fields on the model.

For example:

File:
tableName: files
inheritance:
extends: Eeecore_Record_File
actAs:
Fileable:

The Fileable Template does the following... (the "fileFields" option stores a couple of fields to add to the model)

public function setTableDefinition()
{

foreach ($this->_options['fileFields'] as $key => $field)

}

everything works fine on generate-migrations-models (the initial migrations)... but if we change something on the "fileFields" the generate-migrations-diff call doesn't do anything. We have to rebuild all migrations or write a new migration by hand.