fix unknown operator issue

[Sild]

Hi, I have tried to run your examples and face to an warning message:

sild@:~/jbehave-web/examples/trader-runner-selenium $ ./jetty-server.sh 
./jetty-server.sh: 13: [: unexpected operator
[INFO] Scanning for projects...
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (13 KB at 19.4 KB/sec)
Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 KB at 29.4 KB/sec)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

It's caused by specified shabang: sh does not support [] operator.

In my case, MODULE was not set properly so I can not run your example "out of the box".

My solution will work correctly for any unix operation system.
Thanks.

[Sild]

As another solution you can specify shabash as #!/bin/bash. But my solution is more portable.