Flot project Integration as the drawing engine for the chart plugin.
Add Canvas polyfills for IE8 and below (excanvas.js)
Charts JS validated, excanvas moved as a dependency, Added the chart accessibility as before
Merge remote-tracking branch 'wxt/master' into feature-chart-graph
Default charts colors with the possibility to overwrite it. see issue #842
add JSHint exclusion for: excanvas.js, flot.js, flotPie.js
Retrait de Raphael car il n'est plus requis pour créer les graphiques
Removed Raphael from the jshint exclusion list
Merge pull request #1211 from duboisp/feature-chart-graph

Charts - Use Flot as the drawing engine