Merge pull request #643 from nikkolasg/patch-1

[example] Make the basic example build-able.

cli.go

@@ -12,6 +12,7 @@
 //     app.Usage = "say a greeting"
 //     app.Action = func(c *cli.Context) error {
 //       println("Greetings")
+//       return nil
 //     }
 //
 //     app.Run(os.Args)