Updated mediawiki/extensions
Project: mediawiki/extensions/Math  6468a6746852ef59c33b8b814fa173145546c6a1

Added a hook for modifications to MathJax

The signal 'ext.math.mathjax.customize' is added to the
mathJax.Init function. Extensions can call this signal for
modifications to MathJax.

Change-Id: Ia2bae50cd1fcd15d4775d7b9666679c477060659