Remove/fix css references to a few missing/wrongly located static files.

 At least, this fixes the fatal CachedStaticFilesStorage issue like:

    django/contrib/staticfiles/storage.py", line 74, in hashed_name (clean_name, self))
    ValueError: The file 'ckeditor/galleriffic/css/images/loader.gif' could not be found with <django.contrib.staticfiles.storage.CachedStaticFilesStorage object at 0x86f29cc>`.

which happens during 'collectstatic' 'processing' phase.