Rename method to be more descriptive - 'file names' vs 'possible parts'.

See https://github.com/GaryJones/Gamajo-Template-Loader/commit/f1cef5b1d1060435ee664fc2fdab5be0a9a571ac
Merge pull request #1 from GaryJones/patch-1

Rename method to be more descriptive - 'file names' vs 'possible parts'.