57 wrapping auto docs

[Maximophone]

Related to issue #57

To test:

• build core-python-wrapper
• use core-python-wrapper to wrap an example microservice
• build the wrapped microservice
• The build folder should contain a readme.md file and docker inspect <image_name> should contain a list of labels reflecting the argument that were used when wrapping

[ukclivecox]

/home/.../seldon2.0/seldon-core-fork$ docker run -v examples/models/keras_mnist/:/my_model seldonio/core-python-wrapper:0.5 /my_model MnistClassifier 0.1 seldonio
docker: Error response from daemon: create examples/models/keras_mnist/: "examples/models/keras_mnist/" includes invalid characters for a local volume name, only "[a-zA-Z0-9][a-zA-Z0-9_.-]" are allowed. If you intended to pass a host directory, use absolute path.

because I didn't specify absolute path to model - update docs to ensure people don't make this mistake.

[ukclivecox]

Following the example docs for python the final docker image could not be built

/home/.../keras_mnist/build$ make build_docker_image
./build_image.sh
invalid argument "seldonio/None:0.1" for t: invalid reference format: repository name must be lowercase
See 'docker build --help'.

[Maximophone]

Fixed a bug where image name would default to None (should default to model name in lowercase)

[ukclivecox]

should we add --rm to docker command in docs to ensure exited container is removed after wrapping , e.g.

docker run --rm -v /home/clive/work/seldon/seldon2.0/seldon-core-fork/examples/models/keras_mnist:/my_model seldonio/core-python-wrapper:0.5 /my_model MnistClassifier 0.1 seldonio