Update to 0.618

Upstream changes:
0.618 (03.29.2013) - John Siracusa <siracusa@gmail.com>

    * Made compatible with perl 5.17.10 (RT 84279)

0.617 (12.30.2012) - John Siracusa <siracusa@gmail.com>

    * Added base 2.18 as a prerequisite to avoid a load-order bug that
      occurs with some older versions.
    * Preserve custom class attributes on label objects (RT 82333)
      (Patch by Tom Heady)

0.616 (05.09.2012) - John Siracusa <siracusa@gmail.com>

    * Added add_class(es) and delete_class(es) methods.
    * Added was_submitted() method to the submit button class.
    * Calling clear() on a hidden field now clears it.

0.615 (05.01.2012) - John Siracusa <siracusa@gmail.com>

    * Minor efficiency improvements in HTML generation.

0.614 (04.02.2012) - John Siracusa <siracusa@gmail.com>

    * Deprecated and undocumented the form_rank_counter() method.  It will
      be removed in a future release.
    * Fixed a bug that could cause a repeated form to get the wrong rank.

0.613 (04.02.2012) - John Siracusa <siracusa@gmail.com>

    * Added make_next_form() method to repeatable forms.
    * Documented the empty_is_ok() attribute of repeatable forms.

0.612 (03.26.2012) - John Siracusa <siracusa@gmail.com>

    * Worked around fatal error triggered by loading Rose::HTML::Form
      in the perl debugger in some older versions of perl. (e.g.,
      perl -I lib -d lib/Rose/HTML/Form.pm)

(wen)