Added padded and non-padded versions to grid

Signed-off-by: Mike Gibson <mike@lovehasnologic.com>
Using variables for breakpoints instead of mixing so we can @extend grid sizes instead of using classes.

Signed-off-by: Mike Gibson <mike@lovehasnologic.com>
Added color variables

Signed-off-by: Mike Gibson <mike@lovehasnologic.com>