Updated copyright date in all files
Replaced placeholder.js with updated version
Updated script.js to work with all input placeholders
Updated modernizr to 2.6.2
Updated html conditional classes
Updated reference to modernizr asset
Updated _reset.scss and _utility.scss to reflect updated normalize.css and HTML5BP, added mixins
Updated to 12-column grid
Merge branch 'feature/library-updates' into develop