set -e on android install script, -ff on clean

clean-DATA-LOSS.sh

 #!/usr/bin/env bash
 # Remove everything that is not git tracked on the submodules.
 # May cause data loss.
-git submodule foreach git clean -dfX
+git submodule foreach git clean -dffX
 # sudo here because of: https://tuleap.ring.cx/plugins/tracker/?aid=301
 sudo rm -rf install *.log *.pid

ubuntu-15.10-android-install-all-devices.sh

 #!/usr/bin/env bash
 # Build the Android app and install it on all connected devices.
+set -e
 cd client-android
 ./compile.sh
 # From: http://stackoverflow.com/questions/8610733/how-can-i-adb-install-an-apk-to-multiple-connected-devices