Added python3 hello world example.

examples/hello/python3/.gitignore

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+packages/
+func.yaml

examples/hello/python3/Dockerfile

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+FROM iron/python:3
+
+WORKDIR /app
+ADD . /app
+
+ENTRYPOINT ["python3", "hello.py"]

examples/hello/python3/README.md

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+## Quick Example for a Python3 Function (4 minutes)
+
+This example will show you how to test and deploy Python3 code to IronFunctions.
+
+### 1. Prepare the `func.yaml` file:
+
+At func.yaml you will find:
+
+```yml
+name: USERNAME/hellopy3
+version: 0.0.1
+path: /hellopy3
+build:
+- docker run --rm -v "$PWD":/worker -w /worker iron/python:3-dev pip install -t packages -r requirements.txt
+
+```
+
+The important step here is to ensure you replace `USERNAME` with your Docker Hub account name. Some points of note:
+the application name is `python3app` and the route for incoming requests is `/hellopy3`. These informations are relevant for
+the moment you try to test this function.
+
+### 2. Build:
+
+```sh
+# build the function
+fn build
+# test it
+cat hello.payload.json | fn run
+# push it to Docker Hub
+fn push
+# Create a route to this function on IronFunctions
+fn routes create python3app /hellopy3
+```
+
+`-v` is optional, but it allows you to see how this function is being built.
+
+### 3. Queue jobs for your function
+
+Now you can start jobs on your function. Let's quickly queue up a job to try it out.
+
+```sh
+cat hello.payload.json | fn call python3app /hellopy3
+```
+
+Here's a curl example to show how easy it is to do in any language:
+
+```sh
+curl -H "Content-Type: application/json" -X POST -d @hello.payload.json http://localhost:8080/r/python3app/hellopy3
+```

examples/hello/python3/hello.payload.json

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+{
+    "name": "Johnny"
+}

examples/hello/python3/hello.py

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+import sys
+sys.path.append("packages")
+import os
+import json
+
+name = "World"
+if not os.isatty(sys.stdin.fileno()):
+    obj = json.loads(sys.stdin.read())
+    if obj["name"] != "":
+        name = obj["name"]
+
+print("Hello ", name, "!!!",
+      " from python version",
+      str(sys.version_info.major) + '.' +
+      str(sys.version_info.minor) + '.' +
+      str(sys.version_info.micro))