XBEAN-275 try to keep nice performances but read MANIFEST.MD Class-Path as well

git-svn-id: https://svn.apache.org/repos/asf/geronimo/xbean/trunk@1638797 13f79535-47bb-0310-9956-ffa450edef68
XBEAN-275 avoid useless loops

git-svn-id: https://svn.apache.org/repos/asf/geronimo/xbean/trunk@1638798 13f79535-47bb-0310-9956-ffa450edef68