Features
* install inference toolkit from PyPI.
Bug Fixes and Other Changes
* Fixed awscli
* awscli update
* Update awscli
* Add multi-model capability label to 1.4.0 Dockerfile
* Upgrade the version of sagemaker-inference
* default model_fn and predict_fn in default handler
Documentation Changes
* update README with pytorch eia section
Testing and Release Infrastructure
* refactor toolkit tests.