Upgrade Roo to 1.12.2, and change constructor calls to Roo::Csv, Roo::Excel, and Roo::Excelx to acommodate refactorings
Merge branch 'master' of github.com:AnyPresence/import_extension into next
Change Roo::Csv to Roo:CSV, per suggestion from deprecation warning in Roo library
Add unit tests for xls and xlsx spreadsheets