Updated mediawiki/extensions
Project: mediawiki/extensions/BlueSpiceFoundation  6756ab021c9a1fa6eb1ee411d2122abb571956b2

Clean up foundation

Removed unused BsFileManager class. Greped Extensions/Foundation and had
no found. Also no usages of the methods were found.

Change-Id: I2303943afa46a3bbb27071feb5eaf13e0949214c