tourney import only (WIP)

REST API done for this part, still need to write UI
@garsh0p @jhertz 

no auth integration yet; need to rebase onto master.

(other changes are still on the other branch, which I'll rebase onto this one at some point)
I'm not sure if there's any reason to treat the tio data as a file on the API server side. I feel like the API side should just consider it a big String if anything. The file upload and reading into a String should be handled on the client side.