Ie8 foundation fixes

A handful of IE8 fixes here. We had a bunch of CSS fixes and a few javascript conflicts to resolve, but everything works now in IE8+ 

- Updated our CSS to support the grid in ie8
- update  our CSS to support the foundation grid
- a few smaller css tweaks for IE8
- updated foundation polyfill which was breaking some scripts in ie8
- remove dropdown.js as we don't need it anything
- jQuery.XDomainRequest.js needs to ship to everyone since it needs to be loaded after jquery and before anything that does the DCP. It also needs to be loaded on IE9 for CORS to work properly