[wikimedia] update

- rewrite using BaseExtractor
- support most Wiki* domains
- update docs/supportedsites
- add tests

test/results/wikimediacommons.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+from gallery_dl.extractor import wikimedia
+
+
+__tests__ = (
+{
+    "#url"     : "https://commons.wikimedia.org/wiki/File:Starr-050516-1367-Pimenta_dioica-flowers-Maunaloa-Molokai_(24762757525).jpg",
+    "#category": ("wikimedia", "wikimediacommons", "article"),
+    "#class"   : wikimedia.WikimediaArticleExtractor,
+},
+
+{
+    "#url"     : "https://commons.wikimedia.org/wiki/Category:Network_maps_of_the_Paris_Metro",
+    "#category": ("wikimedia", "wikimediacommons", "category"),
+    "#class"   : wikimedia.WikimediaCategoryExtractor,
+},
+
+)