title: RangeBarChart plotted over time in aChartEngine
body: <p>What I'd like to do is have a <code>RangeBarChart</code> with it's X-axis as dates. Currently adding new bars to a <code>RangeCategorySeries</code> spaces each bar equally, and there doesn't appear to be a mechanism for manually specifying an X value, such as a Date. <code>TimeSeries</code> exists, but appears only to be for <code>LineCharts</code>.</p>
  
  <p>Ideally what I'd need is a method <code>add(min, max, date)</code> on <code>RangeCategorySeries</code>.</p>
  
  <p>Has anyone implemented this or have some tips for me? Thanks.</p>