* Docker work
- New image based on xenial.
- Simplified workflow with docker-compose
- Update the readme with docker-compose section
- Move docker related stuff to a dedicated folder
* Add a gen-cert.sh to the container image
* Document certificate generation and how to test all sample servers
motivation: be able to build and test on linux
changes:
* add dockerfile to create docker image running all toold required for testing on linux
* add readme with instruction on how to use the docker setup
* add script to generate linux tests mapping
* add .swift_version file to explicitly call out the swift version needed to build the project
* adjust code that did not build on linux, mainly casting between Int32 and Int
Cory Benfield