Show shifts that happen on the shift day (#286)
Show shifts that happen on the shift day (#286)

If a shift ends at 2015-11-24 02:00, it should be shown on
`shifts/2015/11/24`. The old query,

    shiftday <= starting_time < shiftday+1

excluded those shifts. The new query doesn't:

    shiftday <= ending_time AND starting_time < shiftday+1

christophmeissner/volunteer_planner,volunteer-planner/volunteer_planner,coders4help/volunteer_planner,klinger/volunteer_planner,klinger/volunteer_planner,volunteer-planner/volunteer_planner,coders4help/volunteer_planner,pitpalme/volunteer_planner,klinger/volunteer_planner,christophmeissner/volunteer_planner,pitpalme/volunteer_planner,coders4help/volunteer_planner,alper/volunteer_planner,alper/volunteer_planner,pitpalme/volunteer_planner,coders4help/volunteer_planner,pitpalme/volunteer_planner,klinger/volunteer_planner,alper/volunteer_planner,volunteer-planner/volunteer_planner,christophmeissner/volunteer_planner,volunteer-planner/volunteer_planner,christophmeissner/volunteer_planner