Merge pull request #789 from jeff1evesque/python_svm_json

#785: Return dependent variable(s) in 'csv_to_json'
Merge pull request #790 from jeff1evesque/python_svm_json

#785: Ensure all data is appended to JSON object
#786: data_validator.py, remove current 'dataset_validation' logic
#786: data_validator.py, correctly iterated list of dict values
#786: data_validator.py, 'validate' each iterated 'value'
#786: data_validator.py, adjust docblock
#786: data_validator.py, minor code indentation
#786: data_validator.py, 'import jsonschema_dataset'
Merge pull request #794 from jeff1evesque/python_data_validator

#786: Adjust 'dataset_validation' validation
#785: svm_json.py, add 'key values'