Fix for #3331

Fix for #3331
@ADmad the ``<version>`` is not mandatory in the phpdoc specifications.

> This tag MAY also contain a version number ...
> ...
> * @deprecated No longer used by internal code and not recommended.

And we didn't enforce any format in our coding standards (yet):
http://book.cakephp.org/2.0/en/contributing/cakephp-coding-conventions.html#commenting-code

But I'm totally fine, if we do so.
In that case we should append a short note to ``@deprecated```in our coding standards.