JuliaStats/DataFrames.jl — pull request #734 by tshort (2014-12-01 21:33:08+00:00)
Title: This adds documentation and a few more methods for `stack` and `unstack`.

The main changes are:

* Added defaults for stack and unstack with fewer arguments.

* Added a method for unstack, so an id column isn't needed.

* Removed pivottable. It wasn't documented, and there are better ways to
aggregate.

* A few little bug fixes.