Adds Ubuntu 15.04 'Vivid' to reprounzip-docker
Adds Ubuntu 15.04 'Vivid' to reprounzip-docker

ViDA-NYU/reprozip,JosuaKrause/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip,JosuaKrause/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip