Datajob

https://github.com/vincentclaes/datajob/milestone/3?closed=1

release notes:

- better handling of AWS region for stepfunctions workflow
- fix stage values that can be set via cli, on init of datajob stack or none at all
- update readme

https://github.com/vincentclaes/datajob/milestone/2?closed=1

release notes:

- add --package poetry / --package setuppy so that we can specify what tool to use to package the code
- shell out commands more securely

milestones: https://github.com/vincentclaes/datajob/milestone/1?closed=1

- use python 3.6
- make stage optional
- easy access data bucket

make it work on python 3.6

first working version.