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/lib/active_support/json/decoding.rb

@@ -0,0 +1,60 @@
+require 'yaml'
+require 'strscan'
+
+module ActiveSupport
+  module JSON
+    class ParseError < StandardError
+    end
+    
+    class << self
+      # Converts a JSON string into a Ruby object.
+      def decode(json)
+        YAML.load(convert_json_to_yaml(json))
+      rescue ArgumentError => e
+        raise ParseError, "Invalid JSON string"
+      end
+      
+      protected
+        # matches YAML-formatted dates
+        DATE_REGEX = /^\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[ \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?$/
+
+        # Ensure that ":" and "," are always followed by a space
+        def convert_json_to_yaml(json) #:nodoc:
+          scanner, quoting, marks, pos, times = StringScanner.new(json), false, [], nil, []
+          while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
+            case char = scanner[1]
+            when '"', "'"
+              if !quoting
+                quoting = char
+                pos = scanner.pos
+              elsif quoting == char
+                if json[pos..scanner.pos-2] =~ DATE_REGEX
+                  # found a date, track the exact positions of the quotes so we can remove them later.
+                  # oh, and increment them for each current mark, each one is an extra padded space that bumps
+                  # the position in the final yaml output
+                  total_marks = marks.size
+                  times << pos+total_marks << scanner.pos+total_marks
+                end
+                quoting = false
+              end
+            when ":",","
+              marks << scanner.pos - 1 unless quoting
+            end
+          end
+
+          if marks.empty?
+            json.gsub(/\\\//, '/')
+          else
+            # FIXME: multiple slow enumerations
+            output = ([0] + marks.map(&:succ)).
+                      zip(marks + [json.length]).
+                      map { |left, right| json[left..right] }.
+                      join(" ")
+            times.each { |i| output[i-1] = ' ' }
+            output.gsub!(/\\\//, '/')
+            output
+          end
+        end
+    end
+  end
+end