mapbox/carto — pull request #361 by 1ec5 (2014-07-04 09:27:05+00:00)
Title: shield-label-position-tolerance (post-Mapnik 2.3)

Added support for [`label-position-tolerance`](http://mapnik.org/news/2012/10/06/gsoc2012-status9/) on `ShieldSymbolizer`s per mapnik/mapnik#2087. Depends on mapnik/mapnik-reference#63.