Added the options to define a starting index, which skips the first items.

Signed-off-by: Martin Andreas Woerz <m.woerz@ieservices.de>
Added Impressum and Datenschutzbestimmungen
Added a configuration option to define a callback method, listening on each event on the list on the jQuery listEffect function to an extra parameter.
Added more demo files.

Signed-off-by: Martin Andreas Woerz <m.woerz@ieservices.de>