Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  b6246f0e0074c0dd2e8a8001252fb313b9b86abb
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(minor) add wb.Snak.prototype.toMap() and wb.Snak.newFromMap()

Adds those two functions which are very similar to toJSON() and newFromJSON(). The plain object
returned by both has the same fields. The difference is that the object's fields returned by the
'map' version do not have to be JSON. In case of PropertyValueSnak the 'datavalue' field will be
the dataValues.DataValue object which would be returned by wb.PropertyValueSnak.prototype.getValue.

Change-Id: I794b87a716e0df0b8d64c8712fe1b8b3318a1767