Make method_missing public in the test framework for Ruby 1.9.

src/about_message_passing.rb

@@ -89,6 +89,18 @@ class AboutMessagePassing < EdgeCase::Koan
     #
     # If the method :method_missing causes the NoMethodError, then
     # what would happen if we redefine method_missing?
+    #
+    # NOTE:
+    #
+    # In Ruby 1.8 the method_missing method is public and can be
+    # called as shown above.  However, in Ruby 1.9 the method_missing
+    # method is private.  We explicitly made it public in the testing
+    # framework so this example works in both versions of Ruby.  Just
+    # keep in mind you can't call method_missing like that in Ruby
+    # 1.9. normally.
+    #
+    # Thanks.  We now return you to your regularly schedule Ruby
+    # Koans.
   end
 
   # ------------------------------------------------------------------

src/edgecase.rb

@@ -36,6 +36,10 @@ class Object
       self.send(method)
     end
   end
+
+  in_ruby_version("1.9") do
+    public :method_missing
+  end
 end
 
 module EdgeCase