JuliaLang/julia — pull request #5520 by ivarne (2014-01-24 21:20:07+00:00)
Title: Added reference to Pkg.free in Pkg.checkout and Pkg.pin

When I say to someone that they must use `Pkg.checkout("JSON", "nd-array")` to test out a branch, it would be nice if the docs for `Pkg.checkout` told them how to get back to normal business after the branch gets merged.