refactor code
remove unuseable dependency and refactor
添加 任务(URL)管理
将Restlet client 换成jersey 访问Restlet Server，因为jersey更快
Merge branch 'master' of https://github.com/cloudsharl/crawler

Conflicts:
	crawler-master/src/main/java/com/zxsoft/crawler/master/impl/RAMSlaveManager.java