Merge remote-tracking branch 'guns/fix-ns-docstring-unescaping'

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Merge remote-tracking branch 'guns/fix-prettify-short-requires'
Merge remote-tracking branch 'guns/no-spaces-on-single-refer-clojure-exclude'
Bump to 1.4.0.
Drop support for slime from elisp interface.
Merge branch 'master' into guns

* master:
  Drop support for slime from elisp interface.
  Bump to 1.4.0.