Fixed to work in IE9 again, new polyfills needed for matchMedia, dataset polyfill removed due to not working correct in IE9
Back to old array push method for columnsItems, was correct before
Enhanced demo styles to match the salvattore website
Prefixed css styles
Merge pull request #34 from MariusRumpf/ie9-fix

Fixes IE9 support.
Merge pull request #35 from MariusRumpf/enhanced-demo

Enhanced examples.