There has been some discussion on the forums on more guidance on starting scripts at boot. The current guidance is to use rc.local but as the documentation points out, if this is misconfigured you can stop your pi booting. I have (before realising I should file an issue first) prepared some guidance on using systemd instead, which has the benefit of being more robust to misconfiguration and is more controlable once setup.
This is related to pull request #681. Apologies for doing things in the wrong order!
Paul