cleanup extra files after javacc task is run.  This allows the user to type "ant parser" and "ant compile" with no manual steps.
cleanup extra files after javacc task is run.  This allows the user to type "ant parser" and "ant compile" with no manual steps.

git-svn-id: efce15992eafbd71412d600875d997890b9afd93@517555 13f79535-47bb-0310-9956-ffa450edef68

apache/velocity-engine,apache/velocity-engine