03/30/2013 Version 1.00 Now supports data roles, officially production
01/26/2013 Version 0.12 Better error handling,merging of data sources
01/19/2013 Version 0.11 Added support for Google Spreadsheet Query Capability
01/17/2013 Version 0.10 Added support for Google Toolbar to allow export of graph data
01/13/2013 Version 0.09 Major Rewrite This is not backwardly complatible with prior versions.
Adds full data format compatibilty across all charts and tables, plus
an example of an Ajax data server. Better control of column headers allows
access to improved tooltips. For prior versions, look at replacing
setAllDataColumns with SetAllTableColumns etc.
01/08/2012 Version 0.08 gTableTool and gJsonTool removed, functionality migrated into gChartTool.
Introduce new method setVisualizationDataType
that allows specification of DataSource
01/05/2012 Version 0.07 Adds support for retrieving chart data via AJAX
01/02/2013 Version 0.06 Introduces column type 'date' (see documentation) for gTableTool
01/01/2013 Version 0.05 setSeriesOption now accepts an array of arguments
12/30/2012 Version 0.04 Cleaned up zip file
12/29/2012 Version 0.03 Allows embedding of tables plus improved phpdoc
12/29/2012 Version 0.02 Allows embedding of charts
12/26/2012 Version 0.01 of gChartTool, a google charting class for PHP