VID-1739 Add jobqueue job for retrying thumb uploads
VID-1739 Add jobqueue delays to API wrappers
VID-1739 Fix some spacing issues
Merge branch 'dev' into VID-1739
VID-1739 purge thumbnail cache after reset
VID-1739 Added documentation
VID-1739 Code Review changes
Merge pull request #3974 from Wikia/VID-1739

VID-1739