http://sn.1w6.org/file/bobjonkman-20141109T175325-zeqlu42.html
GnuPG v1.4 and v2.1 are both supported and under active development; v1.4 is completely functional and is reasonably lightweight; v2.x has more comprehensive commands and additional support for things like S/MIME and ssh — if you're using v1.4 and it's doing everything you need then there's no reason to switch to 2.x