Fixed Strainer#respond_to? to accept two parameters

lib/liquid/strainer.rb

@@ -34,7 +34,7 @@ module Liquid
       strainer
     end
     
-    def respond_to?(method)
+    def respond_to?(method, include_private = false)
       method_name = method.to_s
       return false if method_name =~ INTERNAL_METHOD
       return false if @@required_methods.include?(method_name)

test/strainer_test.rb

@@ -13,4 +13,9 @@ class StrainerTest < Test::Unit::TestCase
     assert_equal true, strainer.respond_to?('size') # from the standard lib
   end
   
+  def test_should_respond_to_two_parameters
+    strainer = Strainer.create(nil)
+    assert_equal true, strainer.respond_to?('size', false)
+  end
+  
 end