Removed reserved 'class' word into visusalization-data-table plugin
Replaced native array method 'filter' by underscore implementation in dw.dataset.js\nNative array method is unsupported by IE < 9
Rebuilded the dw-2.0.js file
Regenerated Datawrapper JS files (dw-2.0 & dw-2.0.min)
Merge branch 'feature/FIX-TableChartIE' into develop