BAC-765: TaskManager cleanup

* remove CloseWikiTask
* remove RemoveWikiTask
Merge pull request #1498 from Wikia/bac-765-close-wiki-tasks-cleanup

BAC-765: TaskManager cleanup
DAR-1727, create base file structure for new TOC extension
DAR-1727, add hooks to overwrite default MW TOC
BAC-758: Migrate CreateWiki::create to use new files storage
Add integration test for file uploads and deletes
Merge pull request #1503 from Wikia/images-upload-test

Add integration test for file uploads and deletes
ImagesServiceUploadTest: check if path contains a hash
Merge pull request #1499 from Wikia/bac-758-create-wiki-upload

BAC-758: Migrate CreateWiki::create to use new files storage
ImagesServiceUploadTest: check thumbnails generation
Merge branch 'dev' into Distributed-File-System

Conflicts:
	includes/wikia/DefaultSettings.php
	maintenance/wikia/lfreport.php
BAC-749: commit current changes and debug logs
BAC-749: fixed invalid config
BAC-749: commit changes ( merge with mediawiki-core )
SwiftFileBackend: remove catch for unknown exception class
cloudfiles.php: PHP hinting to ease debugging
cloudfiles.php: PHP hinting
SwiftFileBackend: prevent endless loop
Force dev Ceph machine to be used when serving uploaded images
cloudfiles.php: PHP hinting