title: PHPExcel get cell currency format other than $ and EUR
body: <p>PHPExcel uses $ and EUR only:</p>
  
  <pre><code>const FORMAT_CURRENCY_USD_SIMPLE        = '"$"#,##0.00_-';
  const FORMAT_CURRENCY_USD            = '$#,##0_-';
  const FORMAT_CURRENCY_EUR_SIMPLE        = '[$EUR ]#,##0.00_-';
  </code></pre>
  
  <p>What I need is to get other currencies (I use "zł" for polish zloty). All currencies excep $ and EUR are marked as 'General'.</p>
  
  <p>Follow-up question to SWilk's answer: How do I use custom format. I put new constants in NumberFormat.php:</p>
  
  <pre><code>const FORMAT_CURRENCY_PLN_1 = '_-* #,##0.00\ [$zł-415]_-';
  const FORMAT_CURRENCY_PLN_2 = '\-* #,##0.00\ [$zł-415]_-';
  const FORMAT_CURRENCY_PLN_3 = '_-* &amp;quot;-&amp;quot';
  const FORMAT_CURRENCY_PLN_4 = '??\ [$zł-415]_-;_-@_-';
  </code></pre>
  
  <p>is it ok? What else I have to do to read formats using</p>
  
  <pre><code>$objPHPExcel-&gt;getCellXfByIndex($cell-&gt;getXfIndex())-&gt;getNumberFormat()-&gt;getFormatCode();
  </code></pre>