Use latest plexus-utils to avoid recursion bug?

git-svn-id: http://zxing.googlecode.com/svn/trunk@2940 59b500cc-1b3d-0410-9834-0bbf25fbcc57
Roll back to 2.3.0-SNAPSHOT for another attempt

git-svn-id: http://zxing.googlecode.com/svn/trunk@2941 59b500cc-1b3d-0410-9834-0bbf25fbcc57