updated POM xsd location to http://maven.apache.org/xsd/maven-4.0.0.xsd
updated POM xsd location to http://maven.apache.org/xsd/maven-4.0.0.xsd

git-svn-id: eb1f970ea32c0800c4377bc634c507679ffb1131@10669 52ab4f32-60fc-0310-b215-8acea882cd1b

lcorneliussen/apache-versions,cjdev/versions-maven-plugin