native plugin for unity to push window into foreground when launched on osx - for this bug
cf http://answers.unity3d.com/questions/988125/why-is-my-application-pausing-when-starting-on-mac.html
BINARY BUILD + instructions
Download and unzip
https://ded.increpare.com/~locus/Foregroundr.bundle.zip
And put Foregroundr.bundle in a directory called Plugins in your unity project (inside the Assets subdirectory)
Add this script to your project and attach it to some object in the first scene of your game.
https://github.com/increpare/foregrounder_plugin/blob/master/ForegrounderPlugin.cs