hadley/plyr — pull request #195 by krlmlr (2014-01-10 21:37:14+00:00)
Title: Don't use a factor for ID column if .id parameter is not set in ldply() and rdply() This is to ensure backward compatibility with the many packages that depend on plyr, e.g., ggplot2

Also: Roxygenize to set C sorting of family-generated documentation