Merge pull request #673 from jeff1evesque/python_data_validator

#628: 'prelearning_data_validation' -> 'dataset_validation'
#462: svm_training.py, call 'dataset_validation'
Merge pull request #674 from jeff1evesque/python_svm_training

#462: svm_training.py, call 'dataset_validation'
#671: config.py, undo changes from 26f6b75
Merge pull request #678 from jeff1evesque/python_config

#671: config.py, undo changes from 26f6b75
#654: data_validator.py, undo changes from b3af218