Upgrade to Rails 2.0.2

Upgraded to Rails 2.0.2, except that we maintain

   vendor/rails/actionpack/lib/action_controller/routing.rb

from Rail 1.2.6 (at least for now), so that Routes don't change. We still
get to enjoy Rails's many new features.

Also fixed a bug in Chunk-handling: disable WikiWord processing in tags (for real this time).

vendor/rails/actionpack/lib/action_controller/test_case.rb

@@ -0,0 +1,53 @@
+require 'active_support/test_case'
+
+module ActionController
+  class NonInferrableControllerError < ActionControllerError
+    def initialize(name)
+      super "Unable to determine the controller to test from #{name}. " +
+        "You'll need to specify it using 'tests YourController' in your " +
+        "test case definition"
+    end
+  end
+
+  class TestCase < ActiveSupport::TestCase
+    @@controller_class = nil
+    class << self
+      def tests(controller_class)
+        self.controller_class = controller_class
+      end
+
+      def controller_class=(new_class)
+        prepare_controller_class(new_class)
+        write_inheritable_attribute(:controller_class, new_class)
+      end
+
+      def controller_class
+        if current_controller_class = read_inheritable_attribute(:controller_class)
+          current_controller_class
+        else
+          self.controller_class= determine_default_controller_class(name)
+        end
+      end
+
+      def determine_default_controller_class(name)
+        name.sub(/Test$/, '').constantize
+      rescue NameError
+        raise NonInferrableControllerError.new(name)
+      end
+
+      def prepare_controller_class(new_class)
+        new_class.class_eval do
+          def rescue_action(e)
+            raise e
+          end
+        end
+      end
+    end
+
+    def setup
+      @controller = self.class.controller_class.new
+      @request    = TestRequest.new
+      @response   = TestResponse.new
+    end
+  end
+end