Listen by default only on localhost

+ Gorilla-REPL provides a non-sandboxed, un-authenticated REPL to everyone
  who can connect to a machine listening on 8990 on any of its active
  network interfaces

> grep gorilla project.clj
(defproject gorilla-transit "0.1.0-SNAPSHOT"
  :main ^:skip-aot gorilla-transit.core
  :plugins [[lein-gorilla "0.3.1" ]]

> netstat -na | grep 8990
tcp46      0      0  *.8990                 *.*                    LISTEN

+ One major issue is providing read access to SSH private keys:
  (slurp "/Users/$USER/.ssh/id_rsa")
"-----BEGIN RSA PRIVATE KEY-----\nM