Add echo.py code

Author: swinton

.gitignore

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+requirements.txt
+package.zip
+output.txt

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 Steve Winton
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

echo.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import sys, os, json
+
+
+def handler(event, context):
+    # A simple function that just returns the event we were passed, along with
+    # the current environment
+    return dict(event=event, environment=dict(os.environ))
+
+
+if __name__ == "__main__":
+    # Read event, context from sys.argv
+    args = [json.loads(arg) for arg in sys.argv[1:2]]
+
+    # Provide None for event, context if not provided
+    while len(args) < 2:
+        args.append(None)
+
+    # Print the output
+    print handler(*args)