ShiftManager: table style
ShiftManager: remove actions (temporary)
ShiftManager: TeamSelector style
ShiftManager: move selector
restruct js/manager
ShiftManager: open/close selector
ShiftManager: create/destroy shifts
ShiftManager: unity interface for creating/destroying shift
ShiftManager: filter operation
ShiftManager: visualize participation
ShiftManager: tooltip
ShiftManager: improve usability
Manager: change some ko.observable to plain attr