Merge pull request #268 from jeff1evesque/python_data_validator

#247: Create 'file_upload_validation()'
#249: load_dataset.php, set 'uploaded file' to 'svm_training.py'
#249: load_dataset.php, store python shell execution into 'result' variable
#249: load_dataset.php, return 'Python Data' to ajax
#249: load_dataset.php, remove JSON components
#249: load_dataset.php, add newline
Merge pull request #269 from jeff1evesque/php_load_dataset

#249: Define 'php/load_dataset.php'
#249: load_dataset.php, comment out 'var_dump(_FILES)'
#249: load_dataset.php, add missing semi-colon
#249: load_dataset.php, temporarily comment 'print result'
#249: load_dataset.php, include 'helper' functions
#249: load_dataset.php, uncomment 'print results'
Merge pull request #271 from jeff1evesque/php_load_dataset

#249: Define 'php/load_dataset.php'
#272: load_dataset.php, add minor comment
#273: ajax_data.js, change file upload variable
Merge pull request #274 from jeff1evesque/js_ajax_data

#273: ajax_data.js, change file upload variable
Merge branch 'master' into php_load_dataset
#272: load_dataset.php, components of the '_FILES' array
#272: load_dataset.php, reorganize comments
#272: load_dataset.php, create initial JSON encoded 'file upload'