[#67] Use outer variables for anonymous functions

The ability to pass arguments immediately to anonymous functions was added in
a newer Zsh version than the one that is shipped with Mac OS X Lion.

helper.zsh

@@ -32,8 +32,12 @@ function autoloadable {
 
 # Loads Oh My Zsh modules.
 function omodload {
+  local -a omodules
   local omodule
 
+  # $argv is overridden in the anonymous function.
+  omodules=("$argv[@]")
+
   function {
     local ofunction
 
@@ -41,17 +45,17 @@ function omodload {
     setopt LOCAL_OPTIONS EXTENDED_GLOB
 
     # Add functions to fpath.
-    fpath=(${argv:+${OMZ}/modules/${^argv}/functions(/FN)} $fpath)
+    fpath=(${omodules:+${OMZ}/modules/${^omodules}/functions(/FN)} $fpath)
 
     # Load Oh My Zsh functions.
     for ofunction in \
-      $OMZ/modules/${^argv}/functions/^([_.]*|prompt_*_setup|README*)(.N:t)
+      $OMZ/modules/${^omodules}/functions/^([_.]*|prompt_*_setup|README*)(.N:t)
     do
       autoload -Uz "$ofunction"
     done
-  } "$argv[@]"
+  }
 
-  for omodule in "$argv[@]"; do
+  for omodule in "$omodules[@]"; do
     if zstyle -t ":omz:module:$omodule" loaded; then
       continue
     elif [[ ! -d "$OMZ/modules/$omodule" ]]; then