Revision history for Perl extension SysTray.

0.11  Mon Jan 19 2009
  - initial version
  - support for Linux, Mac, Windows    

0.12  Tue Jan 20 2009
  - added events for control keys pressed along with mouse buttons
  - Log-off and shut-down system messages are now received

0.13  Thu Jan 22 2009
  - added function for releasing allocated GUI resources
