title: Importing Excel sheet using OpenyPyxl leads to error '__init__() got an unexpected keyword argument 'extend''
body: <p>I'm trying to use Python/openpyxl to import a fairly hefty xl spreadsheet, unfortunately I think that the sheet has some fonts/styles that are not recognized. There are various work constraints that are preventing me from updating this package - which I believe would resolve the issue immediately - (I'm currently using V 2.03). </p>
  
  <p>Other than updating the package, is there any other way to import this?</p>
  
  <pre><code>import openpyxl
  wb = openpyxl.load_workbook('Testing Report - Copy.xlsx')
  type(wb)
  names = wb.get_sheet_names()
  </code></pre>
  
  <p><strong>Resulting error</strong> </p>
  
  <p>..........
   File "C:\Hoops\Deployer\Other\PythonDevTools\Python27\lib\site-packages\openpyxl\reader\style.py", line 106, in parse_font
      return Font(**font)
  TypeError: <strong>init</strong>() got an unexpected keyword argument 'extend'</p>
  
  <p>Thanks!</p>