Properly comment code
Add Ruby to `$PATH` and list of packages
Move the `LANG` & `LC_ALL` exports into `.exports`

Ref. https://github.com/mathiasbynens/dotfiles/commit/2d1d580ac8b0b79f613ef1ae5ad25b7f02555e6d
Support hostname aliases defined in `~/.ssh/config`

Ref. https://github.com/mathiasbynens/dotfiles/commit/969c95bfe9ebd682bcafa84518f916879c48b8d0
Add `cdf`: `cd` to top-most Finder window location

Ref. https://github.com/mathiasbynens/dotfiles/commit/fa14911e953f0d2c8db43538647c9413cca2d5a3
`$PATH` is currently modified in `.bash_profile`