Refactor travis.sh in order to correctly use the exit code of background test process

travis.sh

@@ -34,19 +34,24 @@ elif [[ $OPENPGPJSTEST =~ ^end2end-.* ]]; then
   echo "Testing Configuration: ${testkey}"
   eval $capability
   grunt saucelabs &
+  background_process_pid=$!
 
   # https://github.com/travis-ci/travis-ci/issues/4190
   minutes=0
   limit=30
-  while kill -0 $! >/dev/null 2>&1; do
+  while kill -0 $background_process_pid >/dev/null 2>&1; do
     echo -n -e " \b" # never leave evidences!
 
     if [ $minutes == $limit ]; then
-      break;
+      exit 1
     fi
 
     minutes=$((minutes+1))
 
     sleep 60
   done
+
+  wait $background_process_pid
+
+  exit $? # were comes the status of the background_process :)
 fi