clojure-fill-paragraph doesn't wrap backwards

[arrdem]

At present, clojure-fill-paragraph only scans forwards to wrap lines. I argue that it should scan backwards to the first empty comment line or start of comment and fill everything from that point down.

So for instance: at present

;; foo bar baz
;; qux|

fill is a noop.

Instead, it should fill to

;; foo bar baz qux|

However:

;; foo bar baz
;;
;; quixxity quuxxity
;; flub|

should fill to

;; foo bar baz
;;
;; quixxity quuxxity flub|

[vspinu]

Fixed by #434 btw.

[arrdem]

Thanks!