added few more features, such as datepicker from jquery-ui, ajax events loading, updating events on resizing or drag&droping

added new JQuery ui datepicker,
modified calendar show.gsp to ajaxly fetch only events of the current displayed month,
added "loading..." while fetching
I changed the scaffolded views edit and create for events

when an event is dragged and droped or resized, the event is updated automatically. This is experimental (no real test in case of errors) but working.