New features

• #168: New helper function inf-clojure-switch-to-recent-buffer to select the last buffer an inf-clojure process buffer was swapped to from.
• #187: New defcustom inf-clojure-enable-eldoc to disable eldoc interaction.

Bugs fixed

• #185: Improve cmd string splitting.
• #193: Set syntax table in REPL buffer.
• Fix inf-clojure-display-version (it wasn't extracting properly the package version).