Update CI to fail if exit code is non zero (#1043)

* Try failing CI

* Add && to scripts

* Use set -ev to exit on fail

* Remove && from script

* Remove py-pip for script to fail

* Remove set -ev from test stage

* Remove unnecessary changes

.travis.yml

@@ -60,6 +60,7 @@ jobs:
       services:
       - docker
       script:
+      - set -ev
       - make release-snapshot; export EXIT_STATUS=$?
       # Push images if PR is merged to master
       - |