hadley/reshape — pull request #33 by duncandoo (2013-06-22 13:28:40+00:00)
Title: add_margins() margin column name changed

Following discussion on https://groups.google.com/forum/#!topic/manipulatr/wDiqs9rDYrU, I've implemented the suggestion there to change the automatically generated margin column name so that it starts with a letter.