0.06	Wed May 27 16:06:31 JST 2009
		- turn off some debug messages (thanks to nekoya)
0.05	Tue Apr 21 12:04:10 JST 2009
		- use MRO::Compat instead of NEXT
0.04	Thu Nov 20 12:13:09 JST 2008
		- made more flexible configuration (thanks to masaki)
0.03	Wed Nov  6 18:00:32 JST 2008
		- modified Changes
0.02	Fri Jun  6 11:37:31 JST 2008
		- fully refactored
		- weaken context (thanks to typester)
0.01	Thu Jun  5  0:32:10 JST 2008
		- first release