Manually added dotfile links

This needs to be automated since the current way is clunky and
repetative.  I'd prefer something like:

dotfile {
  [
    '.zshrc',
    '.zshenv',
    '...'
  ]:
  repository => $dotfiles_dir
}

Or even better:

dotfiles { "$dotfiles_dir":
  exclude => [ '.git', '.gitignore', 'README.md' ],
  target => "$home"
}