TyrantVault: Only look up names on-demand
spec/TyrantVault: Factor out setting up vault and cards
TyrantVault: Send a message to a channel when vault changes
Merge branch 'vault'

* vault:
  TyrantVault: Send a message to a channel when vault changes
  spec/TyrantVault: Factor out setting up vault and cards
  TyrantVault: Only look up names on-demand