title: Pandas: Stacked bar plot with adjacent bars
body: <p>Lets say I have the following Pandas dataframe:</p>
  
  <pre><code>&gt;&gt; df
  Period   Income    Expenses   Commissions   
  0        12034.23  1665.25    601.59
  1        23432.77  2451.33    1521.4
  2        62513.12  4210.35    3102.24
  </code></pre>
  
  <p>I'd like to make a stacked bar plot of <code>Expenses</code> and <code>Commissions</code>, and then have the <code>Income</code> column be an adjacent bar next to this stacked column. </p>
  
  <p>I'm familiar with the <code>df.plot.bar()</code> method, but I'm not sure how to shift the x-axis values to have the <code>Income</code> bar adjacent to the stacked <code>Expenses</code> and <code>Commissions</code> bars</p>