Fix parameter handling for gsh and specify bash

First line will be:

#!/usr/bin/env bash

And modifying:

•       ${JAVA} -Xms$MEM_START -Xmx$MEM_MAX -Dgrouper.home="$GROUPER_HOME/" -Dfile.encoding=utf-8 $GSH_JVMARGS -classpath "${GROUPER_CP}" $GSH $*

+       ${JAVA} -Xms$MEM_START -Xmx$MEM_MAX -Dgrouper.home="$GROUPER_HOME/" -Dfile.encoding=utf-8 $GSH_JVMARGS -classpath "${GROUPER_CP}" $GSH "$@"