Variable: !blueprint_grid_columns
----------------------------------
Main layout grid, override these constants to build your grid and container sizes.
Mixin: container()
-------------------
Main layout grid, override these constants to build your grid and container sizes.

Mixin: last()
--------------
you must set text-align left on your container element in an IE stylesheet.

Mixin: column(!n)
----------------
TODO add this to span mixin when we have optional arguments

Mixin: append(!n)
----------------
Use this mixins to set the width of n columns.

Mixin: prepend(!n)
-----------------
Mixin to a column to append n empty cols.

Mixin: pull(!n)
--------------
Mixin to a column to prepend n empty cols.

Mixin: push(!n)
--------------
mixin to a column to move it n columns to the left

Mixin: border(!border_color)
----------------
mixin to a column to push it n columns to the right

Mixin: colborder(!border_color)
-------------------
Border on right hand side of a column.

Mixin: colruler(!border_color)
------------------
Border with more whitespace, spans one column.

Mixin: colspacer()
-------------------
Mixin this to an hr to make a horizontal ruler across a column.