use include instead of include_once
use include instead of include_once

include is faster as it avoids one readpath syscall:
http://blog.ijun.org/2009/11/php-performance-tip-require-versus.html

koala-framework/koala-framework,yacon/koala-framework,Sogl/koala-framework,kaufmo/koala-framework,Ben-Ho/koala-framework,nsams/koala-framework,yacon/koala-framework,darimpulso/koala-framework,Ben-Ho/koala-framework,yacon/koala-framework,Sogl/koala-framework,nsams/koala-framework,darimpulso/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,nsams/koala-framework,koala-framework/koala-framework