Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  ea27ae790c65737a7c1fc9dae49a75a105493b77
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Moving baseclasses and preparing for reuse

Patchset 2: Removed a couple of accidential included files.
Patchset 3: Minor changes to documentation

Change-Id: I0054e368c30fbaa9c14559183866ff03a890d32c