Set CLICOLOR to colorize ls

`ls --color-auto` is not correct of OS X. Set the environment variable
instead (same as using ls -G).

[ticket: X]

modules/utility/init.zsh

@@ -86,7 +86,8 @@ else
     # Define colors for the completion system.
     export LS_COLORS='di=34:ln=35:so=32:pi=33:ex=31:bd=36;01:cd=33;01:su=31;40;07:sg=36;40;07:tw=32;40;07:ow=33;40;07:'
 
-    alias ls='ls --color=auto'
+	# Enable colors for the command line interface.
+	export CLICOLOR=1
   else
     alias ls='ls -F'
   fi