Updated mediawiki/extensions
Project: mediawiki/extensions/Math  c787eb34e70840479029ed05252820b38ec0b91b

Move betafeatures images into the images dir.

It's not really nice to have this lying around in the root of the
extension. Even if it's for beta, better to use a proper subdir, so the
directory is somewhat 'readable'

Change-Id: Ib6e6b27b2169626a4f9028fa0f772bbdab16a40c