Fully automate dev setup with Gitpod

This commit implements a fully-automated development setup using Gitpod.io, an
online IDE for GitLab, GitHub, and Bitbucket that enables Dev-Environments-As-Code.
This makes it easy for anyone to get a ready-to-code workspace for any branch,
issue or pull request almost instantly with a single click.

.gitpod.Dockerfile

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+# Install custom tools, runtimes, etc.
+# For example "bastet", a command-line tetris clone:
+# RUN brew install bastet
+#
+# More information: https://www.gitpod.io/docs/config-docker/
+
+FROM gitpod/workspace-full:latest
+
+USER gitpod
+
+RUN pip3 install pytest==4.4.2 pytest-testdox mock

.gitpod.yml

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+image:
+  file: .gitpod.Dockerfile
+
+tasks:
+  - command: python contemplate_koans.py
+
+github:
+    prebuilds:
+        # enable for the master/default branch (defaults to true)
+        master: true
+        # enable for pull requests coming from this repo (defaults to true)
+        pullRequests: false
+        # add a "Review in Gitpod" button as a comment to pull requests (defaults to true)
+        addComment: false

README.md

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+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/gregmalcolm/python_koans)
+