Merge pull request #366 from jeff1evesque/php_load_logic

#364: load_logic.php, 'print json_encode()'
#364: load_logic.php, add missing paranthesis
Merge pull request #367 from jeff1evesque/php_logic_loader

#364: load_logic.php, add missing paranthesis
#368: data_validator.py, remove unnecessary 'return False'
#368: data_validator.py, properly adjust JSON validation
Merge pull request #369 from jeff1evesque/python_data_validator

#368: Update JSON key in 'data_validator.py'
#368: data_validator.py, update 'file_upload_validation()'
Merge pull request #370 from jeff1evesque/python_data_validator

#368: data_validator.py, update 'file_upload_validation()'
#371: data_validator.py, return JSON formatted error
Merge pull request #372 from jeff1evesque/python_data_validator

#371: data_validator.py, return JSON formatted error
#332: data_validator.py, validate 'svm_dataset_type'
#332: data_validator.py, change 'file upload' -> 'upload file'
Merge pull request #373 from jeff1evesque/python_data_validator

#332: Validate 'svm_dataset_type' in 'data_validator.py'
#376: ajax_data.js, add 'flag_ajax' local variable
#376: ajax_data.js, minor indentation
#376: ajax_data.js, define 'flag_ajax' based on form field
#376: ajax_data.js, add comment to 20c1002
#376: ajax_data.js, add 'if ( flag_ajax )' around 'ajax()'
#376: ajax_data.js, indent code inside 'if ( flag_ajax )'
#376: ajax_data.js, change 'console.log()' message for failed AJAX