Remove empty file.
Keep vimrc lines together.
Annotate generated vimrc file.
Delegate to system `adduser` if it exists. #debian
Add `gcf` to automatically commit fixups.
Don't error if no Homebrew.
Fix git completion for `git add` aliases.
Fix completion for older versions of git. #debian

Reference: be8bb84de666c867e6b998815b09f07bdf018998