Added Lambda Node support as part of the regular functions workflow. (#601)

* Added Lambda Node support as part of the regular functions workflow.

* Fixes for PR comments.

examples/lambda/node/.gitignore

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+func.yaml
+/node_modules

examples/lambda/node/README.md

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+# Lambda Node Example
+
+This is the exact same function that is in the AWS Lambda tutorial.
+
+Other than a different runtime, this is no different than any other node example. 
+
+To use the lambda-node runtime, use this `fn init` command:
+
+```sh
+fn init --runtime lambda-node <DOCKER_HUB_USERNAME>/lambda-node
+fn build
+cat payload.json | fn run
+```

examples/lambda/node/func.js

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+'use strict';
+
+console.log('Loading function');
+
+exports.handler = (event, context, callback) => {
+    //console.log('Received event:', JSON.stringify(event, null, 2));
+    console.log('value1 =', event.key1);
+    console.log('value2 =', event.key2);
+    console.log('value3 =', event.key3);
+    callback(null, event.key1);  // Echo back the first key value
+    //callback('Something went wrong');
+};

examples/lambda/node/payload.json

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+{
+  "key3": "value3",
+  "key2": "value2",
+  "key1": "value1"
+}