[Idea] Customize axis label color / fonts

Thanks for the work on this project, wondering if you could add the options to change in axis labels via the options, like you have set the height option, for example:

      var props = this.props;
      var style = {
        height: props.height || "300px",
        lineHeight: props.height || "300px",
        width: props.width || "100%",
        textAlign: "center",
        color: props.axisColor || "#999",
        fontSize: "14px",
        fontFamily: "'Lucida Grande', 'Lucida Sans Unicode', Verdana, Arial, Helvetica, sans-serif"
      };

[stevecastaneda]

Was able to get it to work:

library={{
            legend: {
              labels: {
                fontColor: "#fff"
              }
            },
            scales: {
              yAxes: [
                {
                  ticks: { fontColor: "#fff" },
                  scaleLabel: { fontColor: "#fff" }
                }
              ],
              xAxes: [
                {
                  ticks: { fontColor: "#fff" }
                }
              ]
            }
          }}

[slangdog]

So I had these charts on a dark background and thought if you could pass another parameter into the JSX component to change the axis labels, for example:

<LineChart axisTextColor="#ff0000" data={{"2017-05-13": 2, "2017-05-14": 5, ...}} />

To change these colors: