AUI-941 Fix Tabs on IE8

Uses the existing tests for IE8
AUI-1031 Allowing scheduler to use arbitrary date as current day
AUI-1031 Fix huge syntax error (lint your code first)
AUI-1031 Add docs
AUI-1031 Add missing constants (lint your code first)
AUI-1031 Source formatting (manual)
AUI-1031 Source formatting (automatic)
Merge branch 'master' into 2.0.x