Download JAR files tagged by classpathcatalogresolver with all dependencies

This generates a schema artifact which contains all of the schemas from xmpp.org's subversion repository. Generating this artifact enables a schema to be referenced by jaxb using the ClassPathCatalogResolver and a catalog file. To refresh the content of this artifact, either remove the src/main/resources directory manually or run a clean build from hudson. This is because maven-scm-plugin is set to checkout only if that directory does not exist so that the remote subversion repository is not hit every time a build is performed.