Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  bf929d6422568df3f45b39d381eb597f841a5108
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Add new _postAndPromiseWithAbstraction() to repo API

Introduces a helper function, easily allowing to extend a jQuery.Promise returned by an API
function with different callback parameters in case of success.

Change-Id: Idd7a9789ddbd1e3d25285197da95e4b850344787