Make it ready for open source

[patrobinson]

This ensures we meet all the checklist items.

Since this code is in production use at Envato and is generic enough to be re-used, I'd like to Open Source it.

[mipearson]

Came here to leave the comment that @andrewjhumphrey already did.

[patrobinson]

I've reviewed the commits and there's nothing untoward in there

[andrewjhumphrey]

All good, thanks for checking.