Merge branch 'mm/mediawiki-usability'

* mm/mediawiki-usability:
  git-remote-mediawiki: allow page names with a ':'
  git-remote-mediawiki: fix incorrect test usage in test
  git-remote-mediawiki: properly deal with invalid remote revisions
  git-remote-mediawiki: show progress information when getting last remote revision
  git-remote-mediawiki: show progress information when listing pages
  git-remote-mediawiki: use --force when adding notes
  git-remote-mediawiki: get rid of O(N^2) loop
  git-remote-mediawiki: make mediafiles export optional
  git-remote-mediawiki: actually send empty comment when they're empty
  git-remote-mediawiki: don't split namespaces with spaces