[travis] Stop building on errors

.ci/travis/linux/script.sh

@@ -27,7 +27,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 export OTB_APPLICATION_PATH=${HOME}/OTB-5.6.0-Linux64/lib/otb/applications
 export LD_PRELOAD=/lib/x86_64-linux-gnu/libSegFault.so
 
-export CTEST_BUILD_COMMAND="/usr/bin/make -j3 -i -k"
+export CTEST_BUILD_COMMAND="/usr/bin/make -j3 -i"
 
 # This works around an issue where travis would timeout because
 # when make is run inside ctest no output is generated. At the current time