Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  dbc696ae42ec000f6090e0b4a7fea50b61f39044

Add topic summary revision type

This will only provide the storage and api access for saving/editing
a topic summary.  UI change is implemented in subsequent patch

Change-Id: Id06006f99c0e7f41f6711ec7ea5a27cbf55fe2c9