Ignore emacs generated files.
Try 'use-package' to manage Emacs deps.

'use-package' is a macro that will install packages if they aren't
present.  Useful when I'm on a new machine.  It also lets you config a
package during install.  More info here:
https://github.com/jwiegley/use-package
Fix bug when setting key codes for iTerm.app.

Used the wrong environment variable name.