Right now executing 'app update [id] [json]' will force an update. The Marathon API makes this optional to avoid bad things from happening, so we should provide this as an option as well.
Along this line, we might want to also make the group updates optionally forced as well. If there is part of a group that is broken, you have to kill that deployment first.
Right now executing 'app update [id] [json]' will force an update. The Marathon API makes this optional to avoid bad things from happening, so we should provide this as an option as well.