Fix agenda list view location

Changed AgendaWindowAdapter to move to a specific time/event id instead
of moving to the day of the event.
Stop fling motion when the today button is pressed.

Bug 5424040 ICS: On opening, Agenda view should scroll to
            nearest upcoming or in progress event
    5547705 AgendaListView keeps scrolling after pressing
            the "today" button.

Change-Id: I8982b4d9254a077e83df48c857c418063b9ea691