bradanlane

Tested with the attached code. The only issue I found was that I expected the `post` response as a return value, similar to how `send_data()` behaves. BTW: looking at `client.py`...

> Regarding the API changes at the server end to accommodate group prefixes for feed keys... **tl:dr;** _As an end user vs a developer or tester of the API, I...

I was only speaking from personal experience and the GitHub search. As an end user, I created my groups, feeds, and dashboards via the web experience. The web experience gives...

I did look at it once but the default user experience gives the simple keys. I get the desire to cover all the bases but from a UX perspective, "the...

Should change to return the response from `_post()` for both `send_batch_data()` and `send_data_to_group()` be done as part of this PR or should it be a separate PR?