Copyright (c) 2011-13 Miles Sabin
Copyright (c) 2011-16 Dale Wijnand
Copyright (c) 2012-18 Lars Hupel, Miles Sabin
Copyright (c) 2013-14 Lars Hupel, Miles Sabin
Copyright (c) 2015-9 Alexandre Archambault
Copyright (c) 2016 Frank S. Thomas
Copyright (c) 2017 Fabio Labella
Copyright (c) 2017 Georgi Krastev