Split-merge - #451

Jenkins is failing with "salloc: error: Job submit/allocate failed: Unable to contact slurm controller (connect failure)" - looking through my emails I think slurm is down for maintenance at Princeton today, can a maintainer please restart the checks once it is back up?

Edit: The macos build is failing with an error related to TFA: "Warning, treated as error:
invalid signature for automodule ('brainiak.factoranalysis.tfa_extension.cpython-37m-darwin')
make: *** [html] Error 2"

@cbaldassano, thanks for the heads up. We are working of fixing the problems.

@qihongl, you can see on Travis that the unit tests are passing, so please disregard the failures and review as soon as possible.

I would be happy to review this! @cbaldassano @qihongl

Thanks @tsy6! @qihongl if you agree that this can be merged then I think it is ready to go - not sure what is causing the linux-specific build error, the error log seems to be related to some kind of compiler misconfiguration (unrelated to this code)

Indeed, the build error was an unrelated. Should be fixed.

@cbaldassano, could you please also write a blurb for the release notes? See this old one if you need to refresh your memory on how they work:
https://github.com/brainiak/brainiak/blob/fe604afbf1b919fb9fe4ce9c5e2c8bede94ec3ef/docs/newsfragments/353.feature

Done!

Thank you for your contributions, @cbaldassano and @tsy6!