AJAX and PHP code added

Added ajax function (line 114) to attempt dynamic data retrieval for a
single donut chart test. Added get_chart_data.php file that determines
what region was clicked and sets arrays for new data sets. Removed
setup and startup of line and bar charts for testing purposes. Can now
return country clicked, but can’t update data values. Parsing error on
line 7 of get_chart_data.php.