CONN-137, refactor modal block background scrolling logic
CONN-137, remove unneeded hot fixes for IE11
CONN-137, remove unneeded force repaint hacks
CONN-137, fix white spaces
CONN-137, fix hiding main Wikia header after adding site wrapper
CONN-137, fix for dynamic background and tooltips on modals
Merge pull request #2584 from Wikia/CONN-137

Conn 137