Thumbnail generation library
* create thumbnails with a predefined frame (possibly an edje frame);
* have an option to create fdo-like thumbnails;
* have a client/server utility.
It's possible to set the following properties of thumbnails:
* format (jpeg, png, eet...)
* have crop?
* crop alignment?
* frame: edje file, group and swallow part to use when generating
* directory: directory where to save thumbnails
* category: to be used as DIRECTORY/CATEGORY/md5.format