Updated mediawiki/extensions
Project: mediawiki/extensions/Ask  39c46dfb1313834e7a987590c879b22a44d8304e

Ground work for deserialization code

* Added Deserializer interface
* Added DeserializationException
* Added objectType key to serialization so objects can be
  unserialized without the need for further context
* Changed various keys and values in the serialization from
  alllowercase to camelCase

Change-Id: Ibb143de40736a789fd60d864a7c6644453021569