Automatically generate Samples wiki page from README files.

Reviewed in http://codereview.appspot.com/5900069/.

Index: samples-index.py
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new file mode 100644
diff --git a/samples/prediction/README b/samples/prediction/README
index b8c3b42..b0a37b8 100644
--- a/samples/prediction/README
+++ b/samples/prediction/README
@@ -1,5 +1,8 @@
 Before you can run the prediction sample prediction.py, you must load some csv
-formatted data into Google Storage. You can do this by running setup.sh with a 
-bucket/object name of your choice. You must first create the bucket you want to 
-use. This can be done with the gsutil function or via the web UI (Storage 
+formatted data into Google Storage. You can do this by running setup.sh with a
+bucket/object name of your choice. You must first create the bucket you want
+to use. This can be done with the gsutil function or via the web UI (Storage
 Access) in the Google APIs Console.
+
+api: prediction
+keywords: cmdline