Apply Julien's unicode-fix changes:
 -- https://github.com/jphalip/glamkit-adminboost/commit/7bca5a05
Make PreviewInline compatible with Django 1.4.

  -- preview implementation failed since validation was tightened in
     https://github.com/django/django/commit/3444b065

  -- also gracefully degrade if thumbnail generation fails.
Update sortable inlines class selectors for Django 1.4 compatibility.
 -- see https://github.com/django/django/commit/17659adf
Prevent deprecation warnings when importing URLs on Django >= 1.4
Fixed PreviewImageWidget -- it won't try to render a thumbnail when the submitted form is invalid
Merge pull request #2 from jonhuber/master

Looks good to me.
Use a template to render the edit link so we can override it, for example to keep the icon small even where we have image width 100% on responsive sites