add explicit Velocity version instead of implicitely using one taken from doxia-site-renderer and maven-reporting-exec dependencies
add explicit Velocity version instead of implicitely using one taken from doxia-site-renderer and maven-reporting-exec dependencies

git-svn-id: 6038db50b076e48c7926ed71fd94f8e91be2fbc9@1378417 13f79535-47bb-0310-9956-ffa450edef68

khmarbaise/maven-plugins,khmarbaise/maven-plugins,khmarbaise/maven-plugins