Add toString() method for easier debugging


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1553417 13f79535-47bb-0310-9956-ffa450edef68
Add missing ASL headers


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@1553418 13f79535-47bb-0310-9956-ffa450edef68