Added docstring by Yannick Gingras.
Added docstring by Yannick Gingras.


git-svn-id: f1daae93ec50fd93b15e4810276f299070365e28@149 1aa58f4a-7d42-0410-adbc-911cccaed67c

euske/pdfminer,pdfminer/pdfminer.six,rotula/pdfminer,goulu/pdfminer