Bugfixes
* AutoFilter.sortState being assignd to the ws.sortState
* Cannot open files created by Microsoft Dynamics`
* Negative percents not case correctly`
* Runtime imports can cause deadlock`
Minor changes
* Preserve any table styles
openpyxl is a pure python reader and writer of Excel OpenXML files.
It was born from lack of existing library to read/write natively from
Python the new Office Open XML format. All kudos to the PHPExcel team
as openpyxl is a Python port of PHPExcel http://www.phpexcel.net/