Add a 'setup' option (vs install)

[michel-slm]

Would be nice to have an M-x clojure-setup option, in addition to the M-x clojure-install, for people who already have Clojure repositories set up.

Another use case would be if for some reason the Git clone fails (e.g. on a crappy Comcast cable connection!). Having just spent several attempts (and bandwith) only to watch the clones of either -contrib or slime getting aborted, I ended up editing the clojure-mode.el file and commenting-out the checkout parts.

So if clojure-install clones the repositories and then hands off to clojure-setup, the latter can be called by people who have set up the repositories already (but might not want to set up Emacs by themselves).

Thanks for the good work -- I just persuaded a colleague to try Clojure, and clojure-mode (+ ELPA) definitely makes the task easier.

[technomancy]

Under the current setup, jars are handled by lein/mvn rather than elisp.