Maven build for MOXy

Dealing with MASTER was not easy, as I first had to fix some compilation errors (Hope those close handlers currently really need no implementation).

As MOXy 2.5.0 ist now available, changed optional dependency to that version. There was a small glitch in build.xml stopping switching back to Oracle after compiling for MOXy from working, so fixed that as well.

Finally, moved MOXy based build to a profile. Just have ant and maven ready and run mvn install -Pmoxy (ok, -DskipTests is currently necessary).