*   Remove signing view
    Widgets are now signed when rendered. This behavior saves one
    call to the application server.
*   Add support for `accept` attribute
    Limit upload policy MIME-Type in `accept` attribute.
*   Add support for `multiple` file uploads
*   Remove `django-appconf` dependency
*   Remove progress bar
*   Add middleware to allow seamless Django integration
*   Add automatical `FileField.widget` overwrite
*   Add tests
*   Reduce file size
*   Reduce asset size