Added routes.

[#79435462]
Added detailed metrics.

[#79435462]
Detailed, per-prison metrics are visible under /metrics/:prison_name.

[Finishes #79435462]
Merge pull request #66 from ministryofjustice/fancier-metrics

Fancier metrics!
changing the name of hollesleybay so that they no longer get confused with warren hill
A migration to accompany this change.