Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  6ab78c8dd8a29f4e24492015a5201702a6aa9d6d

Bug 49428: Default to two preceding newlines for new headings

Also updated the parserTests.txt version and the blacklist.

Change-Id: Id8e5b87602e3ba0f0e1cf6b5c6e03f4949e7d053