Add mixins partial
Adjust grid container size to 1200px
Add vertical rhythm variable to round to nearest half line
Update Modernizr
Add lang attribute; viewport tag modification
Sass updates
Add type-scale mixin
Grid updates
Spacing between grids
Use breakpoint variables for ranged media queries
Merge branch 'master' into ie8-support

Conflicts:
	index.html
	sass/core/_base.scss
Update jQuery to v1.11.1