Update ls alias for os x and zsh

.zshrc

@@ -28,7 +28,6 @@ alias fuck='sudo $(history -p \!\!)'
 alias grep='grep --color=auto'
 alias hidden='ls -a | grep "^\..*"'
 alias killz='killall -9 '
-alias ls="ls --color=always"
 alias m='ncmpcpp'
 alias math='rlwrap MathKernel'
 alias ocaml='rlwrap ocaml'
@@ -39,6 +38,15 @@ alias sml='rlwrap sml'
 alias style='clang-format-3.5 -style=Google'
 alias telnet='rlwrap telnet'
 
+# Enable color support of ls and also add handy aliases
+# Mac OS doesn't support --color flag for ls, needs -G instead.
+if [[ `uname` = "Darwin" ]]
+then
+  alias ls='ls -G'
+else
+  alias ls='ls --color=auto'
+fi
+
 # Turn off the ability for other people to message your terminal using wall
 mesg n