Merge pull request #402 from ilife5/base

升级getEachProxy，处理proxy[param]为vm的情况。升级recycleEachProxy方法，回收subscribers。
refactor getEachProxy method
update ex4
update duplex6
Merge branch 'master' of github.com:RubyLouvre/avalon
update duplex6
重构 getEachProxy,fix #403 BUG
update eachPool --> eachProxyPool
调整一下变量名及位置
update each --> repeat