remove previous layout
added mixin for finding column widths
single column layout for smallest size (2 col)
Merge branch 'dev' into grid-system

Conflicts:
	public/assets/css/app.css
	public/assets/css/layout.scss
fix layout of styleguide
added media query mixins for 6, 12 and 16 column layouts
remove unneeded grid mixin library, Neat
Merge pull request #25 from lightergrey/grid-system

Grid system