auto-complete/auto-complete — pull request #185 by tkf (2012-10-19 17:15:26+00:00)
Title: Treat popup value property when completing candidate

To manually test, execute this:

```cl
(defun actest-value-candidates ()
;; (name . value) -- see `ac-candidates-1'
'(("foofoo" . "foo")
("foobar" . "bar")))

(ac-define-source actest-keywords
'((candidates . (actest-value-candidates))))

(progn
(pop-to-buffer (get-buffer-create "*actest*"))
(auto-complete-mode +1)
(erase-buffer)
(insert "fo")
(run-with-timer 0.1 nil #'auto-complete '(ac-source-actest-keywords)))
```

fixes #148