add download csv as zip example

Author: chfw

examples/zipped_csv/README.rst

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+Serving a Zip file of data within a flask app
+=============================================================
+
+This application shows how to make your data as a zipped csv file

examples/zipped_csv/example.py

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+from flask import Flask, request, jsonify
+from flask.ext import excel
+
+app=Flask(__name__)
+
+@app.route("/download", methods=['GET'])
+def download_file():
+    return excel.make_response_from_array([[1,2], [3, 4]], "csvz")
+
+if __name__ == "__main__":
+    app.run()