Bump version to 1.4

Bump bower dependency versions to latest
Fix ARIA markup
Fix form selector to work in more browsers and to be more consistent
Add better browser support for text-shadow by using compass mixin
Fix nav being huge on resize
Optimize css by adding helpers: colours, background, text colours
Fix placeholder not appearing the same across Windows/mac
Improve support for size-adjust with custom mixin
Improve support for print media query
Fix button styles

Change variables, fix buttons and borders