Make XML collector namespace aware.
Merge branch '1.12' of git://github.com/OpenNMS/opennms into NMS-6961
Add unit test for namespace aware XML data collection. Also had to add a
bit of a workaround to deal with XML documents that have namespaces but
no prefix.
Merge pull request #131 from dschlenk/NMS-6961

Make XML collector namespace aware.