Missing Apache license headers

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1603403 13f79535-47bb-0310-9956-ffa450edef68
Adding a few more headers

git-svn-id: https://svn.apache.org/repos/asf/santuario/xml-security-java/trunk@1603408 13f79535-47bb-0310-9956-ffa450edef68