Allow platform specific or python specific packages to be inclueded in the nightlies
Some packages just work on Linux. Some just work on Python 3. It would be great if we could include these packages in the nightlies as well.
I am thinking of something like:
$ cat extra.txt
bob.learn.tensorflow # [linux]
bob.learn.tensorflow # [linux and py27]
bob.learn.tensorflow # [linux and py2]
bob.learn.tensorflow # [osx or py3]
bob.learn.tensorflow # [py27 or py35]
bob.learn.tensorflow # [linux and (not py3)]