Added set -xe when installing using get.docker.com
Added set -xe when installing using get.docker.com

ViDA-NYU/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip,JosuaKrause/reprozip,jopecko/travis-docker,moul/travis-docker,JosuaKrause/reprozip,William-Yeh/travis-docker,ViDA-NYU/reprozip,ViDA-NYU/reprozip,JosuaKrause/reprozip,ViDA-NYU/reprozip,wpears/travis-docker