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)
Can you change this to compare the set of all aliases and the set of keys in `alias_to_id_map`? Makes me feel better about the condition actually being true.