Hi all, is it possible run gremlin.sh in background? 

I try to use `-e` argument to run a groovy script, and always change to stopped status, but it can finish when change to in foreground.

```

[bin]$ touch test.groovy

[bin]$ ./gremlin.sh -e test.groovy &

[1] 21385

[bin]$ 

[1]+  Stopped                 ./gremlin.sh -e test.groovy

[bin]$ fg

./gremlin.sh -e test.groovy

```

I found there a `stty` process, but redirect stdout to file and `stty -tostop` were not work.

```

[bin]$ ps

  PID TTY          TIME CMD

21347 pts/4    00:00:00 bash

21485 pts/4    00:00:06 java

21541 pts/4    00:00:00 ps

[bin]$ 

[1]+  Stopped                 ./gremlin.sh -e test.groovy

[bin]$ ps

  PID TTY          TIME CMD

21347 pts/4    00:00:00 bash

21485 pts/4    00:00:12 java

21545 pts/4    00:00:00 stty

21546 pts/4    00:00:00 ps

```

Same problem on CentOS7 and docker container, any idea how to solve it?