macOS on Travis-CI

[RMeli]

Added macOS on Travis-CI, addressing #57.

Linux build passes successfully, macOS build fails because of #119.

[andersx]

Once again, thank you for the valuable macOS Travis PRl We had a pull request from Casper Steinmann which should have fixed the seg/fault bug on macOS.

I revieved this PR, but this time Tensorflow seems to have changed it's API. I'll see if I can get this fixed now.

[RMeli]

Good tho hear that the issue should be solved, thanks!

I think pip is now trying to install TF 2 and should probably be pinned to TF 1.x. I can try to fix this later today or tomorrow.

[andersx]

Yeah, I think you are right! I don't know what it will require to migrate the code, I think simply requiring tensorflow==1.x be enough for now.

I don't know if the following is a more long-term solution for the TF code:

import tensorflow.compat.v1 as tf
tf.disable_v2_behavior()

Pinging @larsbratholm

[andersx]

I was trying to get a mac mini for some more internal testing, before I would merge in this change. However, looks like I am not getting one any time soon. I'll look into this again now!

[RMeli]

Closing as stale. Feel free to re-open if needed.