Updated mediawiki/extensions
Project: mediawiki/extensions/Math  5245d0f5550d81019aabb94852a5f27d6431828d

Introduce getter and setter for the MathRenderer

Adds a new method isChanged() for determining if a value was changed.
This is done in preparation for a more elaborated caching method that is
handled inside the abstract base class.

Change-Id: Ica15f77d96453d30edd3a117c7185c694ad3691e