Change `regionCode` to `region` in `tevoOffices` and `tevoVenues`

Also DROPped `tevoOffices`.`email` column since it was empty and the data actually lives in `tevoOfficeEmails`
Merge pull request #10 from jwcobb/bugfix-9-regionCode-to-region

Fixes #9 by changing `regionCode` to `region` in `tevoOffices` and `tevoVenues`