* avy.el (avy-goto-char):
(avy-goto-char-2):
(avy-goto-word-1):
(avy-goto-subword-1):
(avy-goto-word-or-subword-1): Update argument list and docstring.
* README.md: Add a "Contributing" section.
Re #44
* avy-jump.el (avy-style): New defcustom. Replaces `avy-goto-char-style'
and `avy-goto-word-style'.
(avy-styles-alist): New defcustom. Allows to customize the style for
each command separately.
(avy--with-avy-keys): Update.
(avy-goto-char-style): Obsolete.
(avy-goto-word-style): Obsolete.
* README.md: Document style customization.
Fixes#28
