Add initialize_pacman script

This script will initialize pacman-key and populate some keys in
preparation for the other scripts in that directory

install_all

@@ -1,9 +1,6 @@
 #!/bin/bash
 
-sudo pacman-key --init
-sudo pacman-key --populate archlinux
-sudo pacman-key --populate holo
-sudo pacman-key --refresh-keys
+. scripts/initialize_pacman
 
 . scripts/install_lein
 . scripts/install_neovim