Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  0281f1ff79ba70d1013a9c5599149092c53276f2
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(bug 43291) introduction of wb.SnakList, a list containing a set of Snaks

Includes tests and minor changes to the wb.References constructor which is using the list now.

Change-Id: I493d107c9f2d2b297aca36358dcd56b102146a98