Delta API Start/End

[ingalls]

Context

The Delta List API currently supports start/end dates to surface a given list of deltas

Ref: https://github.com/mapbox/Hecate#get-apideltas

We should expand these parameters to support more deterministic methods of accessing delta information by alternatively supporting a start/end delta ID.

Next Actions

• [ ] Add support for start/end Delta ID
• [ ] Add support for offsets from a given start ID
• [ ] Add assoc. tests

cc/ @ingalls