Revision history for Perl extension System::Timeout.

0.01  Thu Jun  9 17:12:14 2011
    - original version; created by h2xs 1.23 with options: -XA -n System::Timeout
0.02  Fri Jun 10 10:10:14 2011
    - some bug fixed
0.03  Thu Jun 16 11:14:24 2011
    - add system_log()
    - make the document more attractive
0.04  Thu Sep 29 17:44:42 2011
    - some bug fixed
    - kill child proc when got $SIG{TERM}
0.05  Thu Nov 17 10:32:39 2011
    - some test remove
    - kill child process use TERM instead of KILL
0.06  Fri Dec  9 22:33:52 2011
	- use IPC::Cmd instead of fork() and exec()
	- rename system_ex() to timeout()
	- delete system_log()
0.07  Mon Jan 16 17:23:55 2012
    - install tar file fix for Linux System.