Add set -euxo pipefail to travis setup script

buildutils/setup_travis.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -euxo pipefail
+
 sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
 sudo apt-get -qq update
 sudo apt-get -qq install g++-4.8 libstdc++-4.8-dev