#253: ../../tests/php/index.php, add references to new AJAX scripts
Merge pull request #255 from jeff1evesque/js_ajax_data

#251: Properly define 'data' attribute in 'ajax' object
#256: dataset_loader.php, rename 'dataset.php' -> 'dataset_loader.php'
Merge pull request #257 from jeff1evesque/php_dataset_loader

#256: Rename 'dataset.php' -> 'dataset_loader.php'
#258: load_dataset.php, rename 'dataset_loader.php'
#258: load_logic.php, rename 'logic_loader.php'
Merge pull request #259 from jeff1evesque/php

#258: Rename php 'loader' files
#260: ajax_data.js, update reference to 'load_dataset.php'
Merge branch 'javascript' of https://github.com/jeff1evesque/machine-learning into javascript
#260: tests/php/index.php, update reference to 'load_logic.php'
Merge pull request #261 from jeff1evesque/javascript

#260: Update AJAX reference for rename PHP loader files
#244: load_dataset.php, add 'global variables'
#244: load_dataset.php, return JSON array to javascript
Merge pull request #262 from jeff1evesque/php_load_dataset

#244: Send 'file upload' from ajax to PHP
#244: ajax_data.js, add array index to '.prop(files)'