Deal with dates that are ranges

[Greatlemer]

Description

Handle dates that are ranges "Apr/Jun" is one example there are many others in the files.

Comments, Questions and Considerations

Probably best to just run the processing script, seeing where it falls over and then trying to deal with that case.

Acceptance Criteria

This story can be considered done when:

Given I'm presented with a date range in a cell
When I try to normalise it
Then I'm returned a tuple of (start_date, end_date)

Given I'm presented with a single date in a cell
When I try to normalise it
Then I'm returned a tuple of (date, date)

[charlottebrf]

Is this related in anyway to challenge faced in #106 ? Or is this separate as BAE systems csv file import worked fine @aspiers ?

[aspiers]

I don't think your google data has date ranges within a single field, which is what this issue seems to be about IIUC.

[Greatlemer]

This is separate and just related to part of the automated cleanup of data.