Merge pull request #245 from jeff1evesque/python_data_validator

#221: Validate session data in 'data_validator.py'
#244: html_form_ajax.js, get 'svm_dataset[]' array values
#244: html_form_ajax.js, remove 'console.log(index)'
#244: html_form_ajax.js, change '.eq(1)' -> '.eq(index)'
#244: html_form_ajax.js, check if 'svm_dataset' element exists
#244: html_form_ajax.js, check 'type' attribute for 'svm_dataset' element
#244: html_form_ajax.js, propery check input element 'type'
#244: html_form_ajax.js, remove unnecessary 'console.log(jeff)'
#244: html_form_ajax.js, remove extra newline
#244: html_form_ajax.js, minor comment change
#244: html_form_ajax.js, add 'svm_dataset[]' to pre-json array
#244: html_form_ajax.js, initial outline for additional ajax object
#246: dataset.php, add initial file
#246: dataset.php, remove typo line
Merge pull request #248 from jeff1evesque/php_dataset

#246: Create 'php/dataset.php'
Merge branch 'js_html_form_ajax' of https://github.com/jeff1evesque/machine-learning into js_html_form_ajax
#244: html_form_ajax.js, add 'console.log()' confirmations
Merge pull request #250 from jeff1evesque/js_html_form_ajax

#124: Send 'file upload' from ajax to PHP
#251: html_form_ajax.js, remove associated 'ajax_data.js' code
#251: ajax_json.js, rename 'html_form_ajax.js' -> 'ajax_json.js'