More details in spell api

I'm looking for more details in the Spell APIs.
I've created process which scrapes data from wowhead, and I'd rather get the data from blizz's APIs for consistency.
I created an API from the wowhead data, here's the docs which explain what I'd love to see in the blizz API for spells:
http://api.wowguild.co/api/doc/#get--api-v1-spells-{id}

Start by reviewing the Spell API documentation and the linked Wowhead-derived API specification to identify the requested details. Done would require a clear decision about which spell fields Blizzard should expose and corresponding documentation, but this issue names no files, tests, or concrete acceptance boundary.

Written by the indexing model from the issue text.