* Added python-magic for smarter MIME type detection (https://github.com/ahupp/python-magic).
* Added a new Document model field: file_mime_encoding.
* Show only document metadata in document list view.
* If one document type exists, the create document wizard skips the first step.
* Changed to a liquid css grid
* Added the ability to group documents by their metadata
* New abstracted options to adjust document conversion quality (default, low, high)
* Added permissions and roles support
* Added multipage documents support (only tested on pdfs)
    To update a previous database do: [d.update_page_count() for d in Document.objects.all()]
* Added support for document page transformation (no GUI yet)