Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  51f73d88584e5793124eccc34f891e57f943e159

New SVG's from design

Included are the new SVG's from design.  They do not belong in the images-NEXT
directory, this is a temporary location untill the images/* can be cleaned out
(while keeping any images we might still need)

Change-Id: I911e476f2f5e938367895f221e243e0a868b0b0b