Better stat --help

Author: jean-philippe-martin

gcloud-java-examples/src/main/java/com/google/gcloud/examples/Stat.java

@@ -72,10 +72,13 @@ private static void help() {
          "or: java -jar gcloud-java-examples-X-Y-Z.jar --list",
          "to list the filesystem providers.",
          "",
+         "or: java -jar gcloud-java-examples-X-Y-Z.jar --check",
+         "to double-check the GCS provider is installed.",
+         "",
          "The purpose of this tool is to demonstrate the gcloud NIO filesystem provider.",
          "",
          "This tool normally knows nothing of Google Cloud Storage. If you pass it a gs://",
-         "file name, it will show an error.",
+         "file name (or --check), it will show an error.",
          "However, by just adding the gcloud-nio jar in your classpath, this tool is made",
          "aware of gs:// paths and can access files on the cloud.",
          "",