Added support for unihandecode.js

Added support for unihandecode.js on the add page form in the admin.
This support must be explicitly enabled by the user and the django CMS
will not ship a copy of unihandecode.js.
Merge remote-tracking branch 'origin/develop' into unihan-slugs
Merge branch 'develop' into unihan-slugs
Updated unihandecode dependency to 1.0.0

Updated the docs to reflect the new layout of unihandecode.js 1.0.0
Added auto-slug for unicode titles to change form
Merge pull request #1605 from ojii/unihan-slugs

Added support for unihandecode.js