title: highcharts with more series that start from different x value
body: <p>i have a chart with 5 different series to represent. One of them has to start from a point of the categories that is not the first one! 
  The categories are represented by an array like this ("200910", "200911", ...... "201407")
  so i assigned to the serie an array like this:</p>
  
  <p>serie1.push(["201201", 12345], ["201202", 1234], ....);
  options.series[0].data = serie1;</p>
  
  <p>but the chart starts always from the first point of the category that is "200910". i think that it does not interpret the value on the x axis
  Where do i'm wrong?</p>
  
  <p>thank you very much
  Cinzia</p>