JuliaStats/DataFrames.jl — pull request #731 by tshort (2014-11-27 16:53:09+00:00)
Title: Updates to reshape functions and updated documentation

I added a few more methods for `stack` and `unstack` and added documentation. 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.