Added explicit System.exit(0) when main is done to work around MacOS X

JDK issue which leaves the JVM running when main is done on command line
apps.
PR:
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git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@194182 13f79535-47bb-0310-9956-ffa450edef68

src/org/apache/fop/apps/Fop.java

@@ -12,6 +12,7 @@ public class Fop {
         CommandLineOptions options = new CommandLineOptions (args);
         Starter starter = options.getStarter();
         starter.run();
+	System.exit(0);
     }
 }