Merge pull request #330 from jeff1evesque/python_svm_training

#327: Use restructured JSON array in 'svm_training.py'
#314: data_validator.py, remove 'self.flag_exit = False'
#314: data_validator.py, replace 'sys.exit()' -> 'return False'
Merge pull request #331 from jeff1evesque/python_data_validator

#314: replace 'sys.exit()' to 'return False'
#315: svm_training.py, check 'data_validation()' for returned value