Suggested addition: ClojureCLR support

[E-A-Griffin]

inf-clojure seems to be the de facto tool in use for ClojureCLR development on emacs without this being officially supported. Adding an official option for cljr via a lein-clr repl would likely make it easier for developers to migrate from clj/cljs to cljr, without adding any significant bloating to the project.

[bbatsov]

I've never used ClojureCLR, but I'd be happy to add support for it. Is there something that you can tackle yourself via a PR?

[E-A-Griffin]

I'd be glad to!