Split out cell rendering into its own renderCell function on tabler, to allow 'cellClassName' attribute to be used for globally setting a classname on all tds
You can now specify the className for individual columnGrouper header cells and pass columnGrouper settings at tabler.create time rather than afterwards
Upgrade expectations
Added option to specify classnames to be appended to the first or last cell in each table when the columnGrouper plugin is active
Merge pull request #10 from BrandwatchLtd/classnames

Added moar classnames