1.2.10: Removes automatic vertical spacing for .col and .row

Note: After using this in production, it proved to great an increase in
complexity. Instead, apply `.nest` units directly to `.grid-items`.

1.2.9

Adds vertical spacing to `.col` and `.row` when display block

1.2.8

Version 1.2.8

1.2.7

Fixes minor spacing issue with .spaced-hv

1.2.6

Adds `.spaced-hv` for vertically spacing rows

1.2.5

Moves subclasses to bottom of file to fix cascade issues

1.2.4: Fixes vertical-alignment bug

`.grid.align-middle` displayed taller than expected because of
inline-block vertical-align: top not being set.

1.2.3

Fixes wrapped grid spacing issues

1.2.2

Fixes min_demension for Firefox

1.2.1

Fixes vertical-alignment bug