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 think it's standard REST design to have your resources be plural. `POST`ing to a resource is always interpreted as adding a single resource.