增加了session模块，和一个运行的应用
Merge branch 'master' of https://github.com/vtejuf/clover-node

Conflicts:
	app.js
	app/control/handle.js
	config.js
	system/modules/cookies.js
	system/modules/crypto.js
	system/modules/sessions.js

	modified:   app.js
	modified:   app/control/handle.js
	modified:   config.js
	modified:   system/modules/cookies.js
	modified:   system/modules/crypto.js
	modified:   system/modules/sessions.js