Revision history for Perl extension BGS.

0.04  2011-10-13
	- BGS::Limit

0.03  2010-01-17
	- bgs_call can return undef
	- without bgs_call value returning detection

0.02  2009-11-27
	- using pipe instead open
	- bgs_call return PID of child proces

0.01  2008-03-01
	- original version