Generate the dictionary from the word list.

Generate the dictionary from the word list if the dictionary is not
present but the word list is.

We need this change for the package to appear in MELPA. See #1.
Reversed order of defcustom and `drupal-spell-find-dictionary'.

See #1.
Mentioned that the ELPA package can also come from MELPA.

Fixes #1.
Release version 0.2.0.

Fixes support for distributing as MELPA package.
Merge branch 'release/0.2.0'