Vendor Rack 1.0.1

Incorporate patch from Revision 496.

vendor/plugins/rack/KNOWN-ISSUES

@@ -0,0 +1,18 @@
+= Known issues with Rack and Web servers
+
+* Lighttpd sets wrong SCRIPT_NAME and PATH_INFO if you mount your
+  FastCGI app at "/".  This can be fixed by using this middleware:
+
+    class LighttpdScriptNameFix
+      def initialize(app)
+        @app = app
+      end
+
+      def call(env)
+        env["PATH_INFO"] = env["SCRIPT_NAME"].to_s + env["PATH_INFO"].to_s
+        env["SCRIPT_NAME"] = ""
+        @app.call(env)
+      end
+    end
+
+  Of course, use this only when your app runs at "/".