Can now parse a return XLSX file

We can now submit a datamap.csv and a single return xlsx file using
the following command, and get a Return JSON string back with the parsed date:

`curl -X POST -F "file=@./datamap.csv" -F "returnfile=@./resources/test_two_sheets.xlsm" \
-F "name=bobbins" -F "description=This is a long description of the datamap." \
http://localhost:5000/v1/return`

I have renamed the old test.xlsm file here to test_two_sheets.xlsm -
having remove a sheet from the test.xlsm. I did this to ensure that the
parsing handles multiple sheets which it does.

Still a fair amount of clearning up here but if you run the server and
send in this request, it works.

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