Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  0b08c255c1565d86ca29586f9d9cbf8833a3822c

Hygiene: move phpunit tests to tests/phpunit

Additionally moved tests to match the main includes/
directory structure. Test count is same before/after:

    OK (274 tests, 669 assertions)

Change-Id: Idf04cd3319d1445ad791eed54ea141e2b31e357e