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/activesupport/test/multibyte_chars_test.rb

@@ -81,6 +81,8 @@ class CharsTest < Test::Unit::TestCase
     with_kcode('UTF8') do
       assert_equal 9, (@s[:utf8].chars =~ /ffi/),
         "Regex matching should be unicode aware"
+      assert_nil((''.chars =~ /\d+/),
+        "Non-matching regular expressions should return nil")
     end
   end
   
@@ -118,7 +120,7 @@ class CharsTest < Test::Unit::TestCase
   
   def test_passthrough_on_kcode
     # The easiest way to check if the passthrough is in place is through #size
-    with_kcode('nonce') do
+    with_kcode('none') do
       assert_equal 26, @s[:utf8].chars.size
     end
     with_kcode('UTF8') do
@@ -151,6 +153,13 @@ class CharsTest < Test::Unit::TestCase
     end
   end
   
+  def test_duck_typing
+    assert_equal true,  'test'.chars.respond_to?(:strip)
+    assert_equal true,  'test'.chars.respond_to?(:normalize)
+    assert_equal true,  'test'.chars.respond_to?(:normalize!)
+    assert_equal false, 'test'.chars.respond_to?(:a_method_that_doesnt_exist)
+  end
+  
   protected
 
   def with_kcode(kcode)