Modernize o.e.dltk.ruby.activestatedebugger. * Bump BREE to Java 1.6. * Enable project specific compiler warnings and fix the enabled ones. * Add missing @Override and remove useless non-javadoc comments. Change-Id: Ib3eacc1da1859ad19a6bd2bd45923adb6e6d7cf5 Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>