Facia tablet breakpoint horizontal space rewrite

For @ironsidevsquincy 

- Items have horizontal paddings (half a gutter on each side)
- collections compensate the lost space with negative margins
- box-sizing: border-box on all items

Needs more testing with embedded components like football tables.

Benefit: basically nothing (-.2KB gain in head.facia.css gzipped, -3.43KB non gzipped)… but a simpler code.

![ ](http://1.bp.blogspot.com/-4VMpaX8IU-o/UnVJocrY9BI/AAAAAAABAyI/kxvYHbo5pOg/s1600/3.gif)