ericf/rework-pure-grids — pull request #1 by ericf (2013-12-17 19:27:43+00:00)
Title: Add .pure-u-1-1 and `includeWholeNumbers` selector which adds .pure-u-1

This adds an additional `.pure-u-1-1` selector to fit with the standard numerator-denominator format. A new `includeWholeNumbers` option as been added (enabled by default) which will add the `.pure-u-1`.