adds detection and formatting of date values #8
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@khaleeljageer had, in the past, caught an issue with this not handling dates correctly.
Now that this is updated to work with both XLS and XLSX files (and documented a little bit), need to add Khaleel's fix for date times into the xlsx_reader file.
the pylightxl library doesn't seem to have as robust of features as xlrd did so we can't detect cell types here. This requires reading the value and guessing that it might be a date.