Use on Mac OSX

[Byrniee]

Info for anyone looking to use the build function only on a Mac:

I was able to get this working by specifying the Editor location in the Unity3DBuildOptions rather than using the helper functions.
You'll also need to trick the system into finding the editor log file by setting the LocalAppData Environment Variable and symlinking the log file to a new location.

export LocalAppData=~/Library/Logs
ln -s ~/Library/Logs/Unity/Editor.log ~/Library/Logs/Unity/Editor/Editor.log