Fixed issues in IE and Firefox and added browser testing results to Readme
Fixed issue with promo image in core experience
Changed fix for abbr tag to work in IE
Improved Readme explaining browser support and removed fix for promo in core experience because it breaks the more menu in all browsers
Fixed the overflow issue on tools theme on core experience and primary
Fixed the overflow issue for primary theme
Merge pull request #54 from Financial-Times/browser-support

Fixed issues in IE and Firefox and added browser testing results to Read...