LMS: removes overkill/turbo :invalid pseudo class style for form inputs
LMS: syncs up edge-based view with new pipeline CSS assets
LMS: syncs up IE warning banner UI with new IE detection technique
LMS: revises IE banner logic to show for IE9 as well
Merge pull request #1385 from edx/talbs/fix-lms-css

LMS: CSS Fixes for Re-architected Pipeline