Move module methods into the class EepLists.
Add some documentation to eep-merge-sheets-from-raw-excel.py.
Add OUTPUT_ENCODING constant to eep_shared.py.
EepSheet class update.

- Put column position constants into a dictionary.
- New methods:
  get_sheet_row_hi
  col_values
  get_student_name
eep-merge-sheets-from-raw_excel.py update.

- Whitespaces.
- Put column positions constants into a dictionary.
- Use argparser for cmd line params.
Add get_graduation_year() to EepSheet class.
Break up long function in combine_sheets().
Add a placeholder README file.
Update column position constant structure in EepCombinedSheet class.
Add method comments; remove some obsolete code in EepSheet class.
Make eep-merge-sheets-from-raw-excel into a class.