Added new parsing file
Amended Cell class, ignore Row class
Shared strings, worksheets automated
Automatically selects sheetData rows only
Optimised string_dict to be list, added def main
Amended offset so that ranges are also updated
Updated .gitignore
Changed print formatting
Stored worksheet parse in class Cell
Minor changes to formatting
Updated .gitignore
Removed git_diff_xlsx - on master branch
Sorted encoding issues with shared strings and nonetypes
Added test file for parse_xml.py
Amended mail program to include solutions to shared string tests
Modifed process_shared_string_row to correct formatted cells
Added MIT license
Changed license to GNU to match pycel
Added license header to parse_xml.py file
Include modules from pycel