Merge pull request #36 from OpenTechFund/feature/95-nav

...ch/public/navigation/templates/navigation/primarynav.html

opentech/static_src/src/javascript/components/mobile-menu.js

...h/static_src/src/javascript/components/mobile-sub-menu.js

opentech/static_src/src/javascript/components/search.js

opentech/static_src/src/javascript/main.js

opentech/static_src/src/sass/abstracts/_mixins.scss

opentech/static_src/src/sass/abstracts/_variables.scss

opentech/static_src/src/sass/components/_button.scss

opentech/static_src/src/sass/components/_icon.scss

opentech/static_src/src/sass/components/_link.scss

opentech/static_src/src/sass/components/_nav.scss

opentech/static_src/src/sass/layout/_header.scss

opentech/templates/base.html

opentech/templates/includes/sprites.html