added listEventsInRange

#platform : android
## Feature added
### _listEventsInRange(start_date,end_date,success_callback,error_callback)_
__usage:__
var evt_startDate = new Date("January 01, 2014 00:00:00");
    var evt_endDate = new Date("February 01, 2014 00:00:00");
    var evt_success = function(message) {
        alert("Success: " + JSON.stringify(message));
    };
    var evt_error = function(message) {
        alert("Error: " + message);
    };
    window.plugins.calendar.listEventsInRange(evt_startDate, evt_endDate, evt_success, evt_error);

__Output:__ list of all the events between January 01, 2014 00:00:00 & February 01, 2014 00:00:00 as a JSON Array
__Information returned:__
* __title__ Event Title
* __dtstart__ Event start time
* __dtend__ Event end time
* __eventLocation__ Event location
* __allDay__ __1__ if all day event or else __0__