[WIP] Nav

**Scenarios:**
- `no-js / <800px` - display icons
- `no-js / >=800px` - hover navicon to display icons, hover icons to display text
- `js / <800px` - clicking displays icons & text
- `js / >=800px` - hover navicon to display icons, hover icons to display text

- [x] Setup breakpoints
- [x] Use jQuery
- [x] Close nav if user switches from tablet to desktop breakpoints
- [x] Add proper links
- [x] Clean up styles
- [ ] Add proper icons
- [ ] Fix IE

![DONA](http://24.media.tumblr.com/85f6ad686e44e2301a6db285ba8fd9cd/tumblr_mtvohaajxo1rpc5kho1_500.gif)