Add .dropboxignore directory to exclude folders without using selective sync

I'd all but given up on this idea... We'd been asking for it for half a decade! Now it seems they've implemented a half-assed solution that causes more work for the user, not less.

I guess my hatred of DB for the contempt they show their users (this is STILL the most requested feature, EVER) isn't gone yet. As soon as a viable competitor enters the market, I'll jump ship. It's so obvious what users want. It wouldn't take much for a company to bridge that gap and steal a ton of users from DB.