Revert "In PHP includes, changes payloads -> dist."

This reverts commit 75915ce1dac683cb2debddc00753db68dff2307c.
Revert "Renames payloads -> dist."

This reverts commit 203adcfdcf7b6decdcfe3fa93a6fb15f1283cb65.
Renames /payloads -> /dist.
Fixes .gitignore error that was leaving /neatine tests untracked. :/