To use, edit the spreadsheet url variable in GoogleDocReader
Format: https://sheets.googleapis.com/v4/spreadsheets//values/Sheet1?majorDimension=COLUMNS&key=
If your spreadsheet looks like this: https://docs.google.com/spreadsheets/d/xxxxxxxxxxxxxxxxxxxxxxxxxxxxx/edit#gid=0, the x's are the spreadsheet identifier
To get an api key: https://developers.google.com/sheets/api/guides/authorizing#APIKey