This adds in the elisp for doing clojure refactoring within NREPL.

[https://github.com/luckykevin/clojure-refactoring]

This process isn't currently super smooth.  You have to add a project dependency to `[yehe/clojure-refactoring "0.9.0"]` in each of your projects.  Let's keep an eye on the project and maybe we can make this smoother over time.