Change the parameters we pass to "process_request"

In the moment the user selects an event the request should pass the start and the end-date of the event of interest to the back-end module. Since #14 (closed) is closed now (at least from my point of view), the request structure for each event should be adapted, for example: from:

{"gid": 383, "query_date": "2010-09-29T00:00:00.00Z", "function_list": ["compute_event_api"]}

to:

{"gid": 383, "event_start": "2010-09-29T00:00:00.00Z", "event_end": "2010-10-09T00:00:00.00Z", "function_list": ["compute_event_api"]}

Just let me know when this is done ..