init font-awesome submodule in assets/fonts/font-awesome
import font awesome
main nav and top navbar basics, dependencies

adapt brad frost's multi-toggle nav pattern
http://codepen.io/bradfrost/pen/qwJvF

note to self: commit more!

# general
- introduce $$DEV tag for development only code

# main.js
- adapted from bootstrap js. pretty straightforward

# _vars.scss
- root-relative path for font awesome
- $container-max-width for container max width
-$menu-dropdown-width

# style.scss
- disable fontawesome extras
- import ui/main
- import ui/navbar

# NEW: _main.scss
- container class

# REMOVE _nav.scss
- it may reappear later…

# NEW _navbar.scss
- it does a lot of stuff… see the codepen above

# lib/nav.php
- add level classes to ul elements (but the first level must be added in the template file!)
- remove depth dependency for dropdown toggle
- DEV ONLY: increase max depth for dropdowns

# templates/header*.php
- add container class to .navbar__inner
- add hidden menu text to button
- use font awesome icon for menu button

- header-top-navbar.php: add hidden menu text to button
- rename nav--main to main-nav (it's not a modified version of nav, that's one level down)
change on-activation rewrite rules to be less specific

.htaccess in environment root was updated to reflect these changes
navbar__inner should not have container  class, content should float left with padding
move general nav to _nav.scss, keep top navbar specific code in _navbar.scss
further ui improvements to navbar, introduce nav-divider mixin
fix broken dropdown due to lack of media queries
revised nav-dividers mixin to include stacked version
move var defs to top of relevant files
use inuit style file headings
don't use dividers for stacked nav when nav isn't stacked
a quick and dirty fix for inline-block spacing in navbar...
…but it doesn't matter because there's no need for background color @desk++
remove the arrow from dropdown (it wasn't displaying in the first place)
introduce default color palette

- include gray scale
fix clearing issues in navbar and nav

- remove navbar__item class
toggle active classes on hover, remove active classes from inactive li elements
highlight on hover for current menu item, define contextual SCSS vars, rename SCSS vars for BEM

- TODO: dropdown parent items should remain highlighted
navbar font size and dropdown icon size