* add docker configuration
Why:
* it's a nice way to work in a disposable environment
This change addresses the need by:
* add dockerfile
* update readme to explain usage
Reference Links:
*
* switch to using official python image as a base
Why:
* removes a lot of custom setup
This change addresses the need by:
* swap out buildpack-deps:trusty with python:3
* remove setup lines that are no longer required
* clean up comment to describe the RUN command
Reference Links:
* https://hub.docker.com/r/library/python/
James Chevalier