Refactored GrowlMail to have a separate singleton notifier object, in order to make the mail-bundle class less dependent on being a singleton. (Assumptions are bad, especially when you're working with private/undocumented APIs.)

 /*

  * Prefix header for all source files of the 'GrowlMail' target in the 'GrowlMail' project.

  */

 #ifdef __OBJC__

     #import <Foundation/Foundation.h>

     #import <AppKit/AppKit.h>

 #endif

 //#define GROWL_MAIL_DEBUG