Bar chart mouseover is handled outside react

[rach]

This is be plug back into the react/redux machinery using dispatch or action. I was initially worried about redrawing all the graphs.. It needs to be investigated further

  .on("mouseover", (d, i) => {
    //this should use action dispatch to update the state
    var t = datetimeFormat(new Date(xdata[i] * 1000));
    JQuery(React.findDOMNode(that)).find('.bar-value').text(t + " => " + yFormatter(d));
  })
  .on("mouseout", (d, i) => {
    //this should use action dispatch to update the state
    JQuery(React.findDOMNode(that)).find('.bar-value').text("");
  });