* avy.el (avy-read): Call DISPLAY-FN in buffer's reverse order.
(avy--overlay-at-full): When there's an avy overlay after point, shorten
the current overlay to one letter.
Re #5
* avy.el (avy-handler-default): New defun.
(avy-handler-function): New variable. Bind this temporarily to catch bad chars.
(avy-read): Forward to `avy-handler-default'.
* avy-jump.el (avy--goto): Consider the case of 'exit symbol being
returned.
(avy-goto-line): Bind `avy-handler-function' to catch digits and call
`goto-line' in that case.
Fixes#29
