Move tsd_get to use 2.0 /api/query endpoint

[manolama]

Hi! Thank you so much for this awesome tie in! We had an analyst who wanted to use R for accessing our OpenTSDB data and I was able to spin up your module and get him up and running.

I saw that the tsd_get() method is using the /q endpoint to fetch data. We're deprecating that in 2.0 and trying to get folks to move over to the new /api/query endpoint. It returns JSON data so hopefully R would be able to parse that fairly easily. And if there is a format that's better for R, we could write a serialization plugin to return results in that format.

Thanks again!

[dholstius]

Glad it's useful! Sorry for the slow response. I'll push an update next week. Not sure what serialization would be best for R, but now that I know there's interest, I'll give it some consideration! This code's been stagnating while I finished a dissertation, but that's finally over, and I'd like to resurrect the effort.

[sanblch]

Please look at #6. It is done there.