New options support for charts

[renaudpawlak]

chartOptions.options.borderRadius = 30
chartOptions.options.barThickness = 40
chartOptions.options.plugins.legend = {
    labels: {
      usePointStyle: true,
      pointStyle: "rect"
    }
}
chartOptions.options.scales.y.ticks = {
    callback : function(value) {
        return this.getLabelForValue(value).split(/[\s_]/)
            },
    autoSkip: false
}