Bukkit

Method 1.) This method has no configuration options. When the vote starts it will only listen for '/dv night' votes and '/dv day' will be disabled. If just 1 person votes for night then the night stays. If nobody votes for night then it automatically turns to day.

Method 2.) This method has 1 configuration option as stated here. When the vote starts it will listen for both '/dv night' votes and '/dv day' votes. If the configured amount of people voted for day (default 3) then it will turn to day unless someone voted for night because then the night would stay.