cider-nrepl 0.18

New features

• #540: Added support for nREPL 0.4.
• #532: Added a boot task to start the nREPL server (allows us to run nREPL 0.4 before boot upgrades to it).

Changes

• Drop "official" support for Java 7 and Clojure 1.7 (although they might still work for a while).
• Extract the info related functionality to orchard.

Bugs fixed

• #535: Check for cemerick/piggieback, before checking for
  cider/piggieback.
• #542: Qualify references to *out* and *err* in wrap-out.