Merge pull request #539 from jeffvalk/master

Enable 'jump' keybindings for stacktrace navigation.
[Fix #540] Correct a wrong font reference
Enforce code style via .dir-locals.el
Code style
Warn on startup if cider-nrepl is not available
Revert "Warn on startup if cider-nrepl is not available"

This reverts commit 2ded320a63ac4fa8ed8615a98297656c93c714ef.
Enable full Java participation in Clojure symbol lookup.

Use `completing-read` prompt to disambiguate unqualified instance
method symbols.