#752: data_validator.py, determine how to remove first column
#752: data_validator.py, uncomment code
#752: data_validator.py, adjust comment
#752: data_validator.py, add comment
#752: data_validator.py, validate first record of first column
#752: data_validator.py, adjust error message
#752: data_validator.py, fix typo
#752: data_validator.py, add comment
#752: data_validator.py, adjust variable name
#752: data_validator.py, validate remaining column items (labels)
#752: data_validator.py, adjust error message
Merge pull request #763 from jeff1evesque/python_data_validator

#752: Restructure 'dataset_validation'