hadley/ggplot2 — pull request #840 by krlmlr (2013-07-12 00:17:46+00:00)
Title: Specify different horizontal and vertical margins for facets

A straightforward extension. Includes an outstanding update of the .Rd files in the first two commits (i.e., #833), a minor bugfix (8e61554), the implementation with documentation (0001ce5) and an update of the .Rd files with the current changes (f11a4ba).

No test has been added yet. This code works for me.