* Update samples for several languages.
Just whitespace changes and some reordering where the order doesn't matter.
* Adding generated .swagger-codegen/VERSION files.
This is the result of
- `$ git checkout master`
- `$ bin/run-all-petstore`
No change was made to the code, just ran the aggregate sample generation
script.
* added supporting files for Dockerfile and dockerignore generation for python-flask lang
* documenting how to build the docker image and how to spin up a container
* updating pet store sample
