Bumped dependency versions

Updated dependencies as suggested by ticket http://tracker.deegree.org/deegree-services/ticket/492

Note that jaxen seemed to be available only in version 1.1.4, not 1.1.6 as suggested.

Also, I only updated dependencies with known updates.

Also includes dependency and plugin updates as suggested by the versions maven plugin: http://mojo.codehaus.org/versions-maven-plugin/index.html