DAR-1422: fix mainpage column tags for responsive layout.
DAR-1422: fix for smaller screens.
Merge branch 'responsive-layout-regressions' into DAR-1422

Conflicts:
	skins/oasis/css/core/responsive.scss
Merge pull request #1217 from Wikia/DAR-1422

DAR-1422: Fix mainpage column tags for the responsive layout