Add Tag information to the CSV export of attendees

[mariobehling]

The tag information is currently missing from the CSV exports of attendees. Please add this info as a column into the attendee CSV.

[noobyco]

I'll work on this issue. Can you tell me where can i test the CSV tag feature other than https://eventyay.com/? I just don't think creating an event on a production application will be a good idea, just to test out a feature.