Footer content and design

Add 'services icons' to SVG sprite sheet
  - Github
  - Twitter
  - Instagram
  - Email

Link to SVG symbols from external src
  - http://css-tricks.com/svg-use-external-source

Comment out imagemin
  - SVGO is stripping IDs from SVG symbols, needs fixing

Include H5BP helper classes
  - https://github.com/h5bp/html5-boilerplate/blob/master/src/css/main.css#L109

Create abstraction for List style components