Also exclude <hr> from default box-sizing due to firefox issues
Modify grid to have full-width gutter on the sides (previously only half)
Change default radius and grid-gutter values
Cleanup font-related variables
Make links more obvious (color)
Default heading font-sizes
Use box-radius variable for border-radius on boxes (duh)
Basic button styles
Transition basic button styles
Fixed styles for different button sizes
Button, inline icon styles
.caps class for uppercase buttons
Increase opacity on disabled buttons from .25 to .5
Create button-group styles for, well, button grouping