Update 'doc' for special forms and Java symbols.

Add tests for equality to the canonical 'clojure.repl/doc' format.

Refactor doc formatting function.

Update doc tests to fail (not error) when returned doc is nil.
Merge pull request #551 from jeffvalk/master

Update 'doc' to support special forms and Java symbols.
Add C-u M-x cider-jack-in option to edit the whole server command