Revert "Remove CIDER and clj-refactor"
Revert "Remove CIDER and clj-refactor"

This reverts commit 6fbbdbba1d48f1e9c61407573a5dc183117adfea. The offending bug
in CIDER has been fixed:
https://github.com/clojure-emacs/cider/commit/8fef15e7ef83793f1cdc29404ce57596406935d3

samestep/env