This patch series tries to integrate all the feedback received in the recent review from Eric Sunshine. It completely removes the confusing changes to get_mw_namespace_id_for_page() because I believe they are unrelated to the namespace support.
I also split up the last patch in 4 different patches for clarity and fixed the vocabulary (it's "virtual" namespaces, not "special", which is a specific namespace). I left that die() in there because it makes the code a little cleaner and I'm lazy. Thanks again for the good feedback!
