Adding valid return code

I have been able to get travis ci builds working by pulling in my install script changes with a valid return code.  See: https://travis-ci.org/Grails-Plugin-Consortium/grails-filterpane-demo/builds/7023338

Currently the script is returning code 1 and that is considered a failure.  Somewhere it needs to return a 0 if things go correctly with and without the auto answer on.