o updated prerequisite to Maven 2.0.6 since plexus-utils version is > 1.1

o upgraded plexus-utils to 1.5.1 to support spaces in dir name

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk/maven-ant-plugin@645098 13f79535-47bb-0310-9956-ffa450edef68