Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  109bbe6ac135367e6b0564b1a634358244e27fb1

Namespacing MMV properly

Everything is under mw.mmv now.
(Also, I cut down on the number of direct global instance references a bit.)

Change-Id: I88bb3b62b82ce54126dd069b0aab4412d9404719