Move performer logic to private/ dir

[jverkoey]

All performer logic should be added to swift files in the src/private sub-directory.

See the Core Animation family for an example: https://github.com/material-motion/material-motion-family-coreanimation-swift/tree/develop/src/private

[rcameron]

Would be worthwhile to mimic the Swift access levels model and call it src/internal since performers will most likely be internal?

[jverkoey]

Oh! Interesting question. Our src/private concept comes from our Objective-C conventions. I could get behind introducing a src/internal distinction for swift conventions.

Can you start a discussion about this on the team repo?

[jverkoey]

🎊 My diff is ready for review at http://codereview.cc/D1814