title: Reordering columns/rows of a pivot_table?
body: <p>pandas's pivot_table seems to return columns only in alphabetical order, such that</p>
  
  <p><code>pivot_table(tips, 'tip_pct', rows=['sex', 'day'], cols='smoker', aggfunc=len)</code></p>
  
  <p>gives:</p>
  
  <pre><code>  smoker     No  Yes
  sex    day          
  Female Fri   2   7  
         Sat   13  15
         Sun   14  4  
         Thur  25  7  
  Male   Fri   2   8  
         Sat   32  27
         Sun   43  15
         Thur  20  10 
  </code></pre>
  
  <p>If I wanted to put <code>Thur</code> above <code>Fri</code>, and <code>Yes</code> to the left of <code>No</code>, how would I go about it?</p>