Fix various colorization issues in Monobook

This commit addresses several color problems in the Forum and WikiaStyleGuide extensions caused by pulling colors set in the Theme Designer for the Oasis skin.
Fix out-of-place black background
Additional colorization fixes (VOLDEV-36)
code cleanup
VOLDEV-47 - Add select all button to Special:ListUsers
Merge branch 'dev' into VOLDEV-36

Conflicts:
	extensions/wikia/Forum/css/RelatedForumDiscussion.scss
enforced VOLDEV-36 changes
use .prop() over .removeAttr()
set check using .prop() too
VOLDEV-36: Separate Monobook styling
VOLDEV-36: include mixins
Merge branch 'dev' into VOLDEV-36

Conflicts:
	extensions/wikia/Wall/WallHistoryController.class.php
Add newlines
VID-1582 starting to reorganize thumbnails
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 'VideoSprint50' into VID-1582
VID-1582 fixing issue with thumbnail lazy loading
VID-1582 cleaning up unused params in the thumbnail video method
VID-1582 Partial work to share w/ Liz