twbs/bootstrap — pull request #8977 by plankguy (2013-08-01 17:25:14+00:00)
Title: Fixed pull/push columns @ sm & lg sizes. Added collapsable & centered grid columns ...

I've added a simple way of fixing push/pull cols for sm & lg columns simply by only applying the push/pull to the corresponding size for the corresponding media query.

Added .row.collapse to remove default padding from columns.

Added .centered to to column classes to remove float and center a (single) column.