* construct channel input using json.dumps()
* remover data_location parameters
* add changelog
* Update version in license file and small changes to readme
* Don't leave active_learning_model_arn.txt empty
* updated readme for ground_truth_pipeline_demo
* update docker repo
* Small changes to readme of ground truth sample pipeline
* Added Spot Instance Support
* Fixed missing output configuration
* Added spot instance support to example pipelines
* Updated image to new repository
* Update docker images and minor refactoring
* Update image tag, bug fixes, remove unneeded imports
* Revert to using image version, use origin batch transform output method
* Forgot to save 2 changes
* Add components for workteam and Ground Truth, minor update for HPO and train, add sample pipeline demo for workteam and GT, update images
* Minor style fixes
* Address PR comments
* Refactor for new folder structure
* add HPO component and sample pipeline usage
* Update Dockerfile to include HPO component
* Update docker image used in hpo component
* Update HPO readme, make HPO job name required, allow empty string for int params, reintro some default values
* Resolve a couple todos
* Add Dockerfile for HPO and update docker image used in HPO component
* Add Dockerfile for HPO