clojure-mode.el (clojure-docstring-fill-column): Use `fill-column' as the default value

* clojure-mode.el (clojure-docstring-fill-column): Use
`fill-column' as the default value.
Merge pull request #233 from bzg/master

clojure-mode.el (clojure-docstring-fill-column): Use `fill-column' as th...
Update copyright
Fix indentation
Remove mention of Ritz
Update code snippet highlighting to use el instead of lisp

They're pretty much the same, but still...
elisp -> Emacs Lisp
Properly font-lock def form docstrings