Make sure training function doesn't zip up virtualenv folders

[slinlee]

@ejunprung reported that the SAP sim ended up being a 20mb upload even though it's just a few kb. I'm suspecting the venv folder was caught up in the zip?

[slinlee]

Actually, he was running .train() from a higher level dir, which caught a lot of things in the zipfile. Closing for now.

[maxpumperla]

@slinlee all true, but we should still think about at least having a note on the readme for that. I don't think we can safely detect all kinds of virtual envs programmatically. So we might have to suggest to "just delete it" before upload, or have some sort of .pathmind_ignore file specifically for that.

[maxpumperla]

could default to .gitignore

[slinlee]

.gitignore could work, but personally I'd be likely to include obs.yaml in the gitignore since it's generated