Update to 5.504

Changelog:
5.504   2013-01-30  David F. Skoll <dfs@roaringpenguin.com>

* VERSION 5.504 RELEASED

* Fix encoding of MIME parameters that contain a quoted
  string:  "like \"this"
  https://rt.cpan.org/Public/Bug/Display.html?id=80433

* Suppress useless warnings from tests
  https://rt.cpan.org/Public/Bug/Display.html?id=80679

* Fix long-standing bug in encode_mimewords that can
  break multibyte-encodings (eg, utf-8)
  https://rt.cpan.org/Public/Bug/Display.html?id=5462

5.503   2012-06-08  David F. Skoll <dfs@roaringpenguin.com>

* VERSION 5.503 RELEASED

* Avoid inappropriately untainting data
  https://rt.cpan.org/Public/Bug/Display.html?id=67119

* Localise $\ to avoid parsing problems if it's set elsewhere
  https://rt.cpan.org/Public/Bug/Display.html?id=71041

* Improve exorcising of filenames
  https://rt.cpan.org/Public/Bug/Display.html?id=71677

* Fix potential race condition in t/Smtpsend.t
  https://rt.cpan.org/Public/Bug/Display.html?id=68879

* Allow native I/O on File::Handle objects
  https://rt.cpan.org/Public/Bug/Display.html?id=72538

* Add "recommends Convert::BinHex" clause to Makefile.PL
  https://rt.cpan.org/Public/Bug/Display.html?id=72223

* Add module_name to Makefile.PL
  https://rt.cpan.org/Public/Bug/Display.html?id=77138

* Fix "Uninitialized value" warning
  https://rt.cpan.org/Public/Bug/Display.html?id=77190

* Don't run t/Smtpsend.t on systems that lack fork()
  https://rt.cpan.org/Public/Bug/Display.html?id=77351

* Add "use strict" everywhere
  https://rt.cpan.org/Public/Bug/Display.html?id=77582

(ryoon)