Instead of to_json, use to_js for each property

This is to handle objects other than plain old data.

Author: ledsun

ext/js/lib/hash.rb

@@ -1,8 +1,10 @@
-require "json"
-
 class Hash
   # Convert a hash to a JavaScript object
   def to_js
-    JS.eval("return #{self.to_json}")
+    new_object = JS.eval("return {}")
+    self.each do |key, value|
+      new_object[key] = value
+    end
+    new_object
   end
 end