Add `bin/rename-identifier`
Add `bin/rename-identifier`

Bulk-renames identifiers inside one or more files. For example, to
rename `User` to `Person` in all Ruby files under `app` and `lib`, do:
    rename-identifier User Person {app,lib}/**/*.rb

wesm87/dotfiles,wesm87/dotfiles,wesm87/dotfiles,wesm87/dotfiles