修改一处dev log的内容
增加default/fetchURL.js
fixed the fetchurl, add chain.js
重构Router部份,
	更改router实现由chain变为tree.
	增加sub router的实现,提供以API允许以配置文件以外的方式进行增加.

Changes to be committed:
	new file:   libs/router.js
  new file:   test/test_chain.js
	new file:   test/test_router.js

 Changes not staged for commit:
	modified:   default_action/fetchURL.js
	modified:   httpd.js
	modified:   libs/actionVisitor.js
	modified:   libs/chain.js