no need for .nav--pills
menu link placement within header, look and feel
exai: reduce specificity of nav menu levels

https://github.com/montchr/exai/commit/52bc4ad78684fcb09ff48dc195b470a5ab1641d1
restore .main-nav__inner to ease floats

depends on exai commit 52bc4ad78684fcb09ff48dc195b470a5ab1641d1

https://github.com/montchr/exai/commit/52bc4ad78684fcb09ff48dc195b470a5ab1641d1
give primary nav a stylable class
replace social font awesome icons and logo with grunticon icons

however this causes an issue with exai since it is still dependent on font awesome.

also, some icons in the nav menu are still font awesome.

icon class names must be temporarily renamed to `.grunticon-*` so as not to conflict with font awesome.

https://github.com/montchr/tuupdate/issues/1
vertical spacing in main nav
exai: remove font awesome dependency

https://github.com/montchr/exai/commit/c6fc71407d4264c3a934bab97f4f83617ecd3b48
exai: fully remove ubuntu mono dependency

https://github.com/montchr/exai/commit/f31458e8d71de886d55c12fd2e68b0249a53c129
replace all icons with a custom icon font

logo is excluded, still using grunticon
change dropdown background color
brand placement, logo size

logo should touch the bottom of the nav
sizing and borders on social menu
header divs, spanning full width
introducing the corner cut.

- many thanks to @charlotte_dann http://codepen.io/pouretrebelle/pen/pbwIj

- nav dropdown menu needs a higher z-index

- and in case you're not happy with the non-parallel cuts by the logo, it turns out 23 IS a magic number. but the mixin will have to be rewritten to allow for overriding the angles.
typekit, uppercase nav items
full width footer - it's not a paine!
footer content
exai: don't give container a background, add a root class and style that.

https://github.com/montchr/exai/commit/55b74e0b3bef4bc482463f40803d072dcd7634eb
root background color