hadley/ggplot2 — pull request #910 by stefanedwards (2014-02-25 09:05:07+00:00)
Title: Feature/stefanedwards labeller

Resubmitting #904:
These two functions aid when labelling facets. labeller allows for
providing multiple named vectors and/or methods to change the labels for
each margin. label_wrap_gen allows labels to be word wrapped.