Exit travis-install script on error

script/travis-install

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 sudo sh -c "wget -qO- https://get.docker.io/gpg | apt-key add -"
 sudo sh -c "echo deb http://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list"
 sudo apt-get update