Python 2.7

Openpyxl 2.3.3 patch
Allow to load images when reading existing excel file

from openpyxl import load_workbook

from op_patch.excel import load_workbook as patch_load_workbook
load_workbook = patch_load_workbook

Thanks to openpyxl team and thanks to Sergey Pikhovkin for her first version of the patch.