hash.rb in aigu-0.4

- old
+ new

@@ -2,6 +2,12 @@
   def self.recursive
     new do |hash, key|
       hash[key] = recursive
     end
   end
+
+  def symbolize_keys
+    reduce({}) do |memo, (key, value)|
+      memo.merge! key.to_sym => value
+    end
+  end
 end