Merge pull request #23 from atellwu/master

修复bug，优化代码
Merge pull request #24 from atellwu/master

修复一段代码：异常后，也需要sleep
sleep
Merge pull request #25 from leoliang/master

sleep yi hui
Merge branch 'master' of https://github.com/dianping/puma
Pumadmin的status改为从数据库查询binlog位置即可，不需要从SyncServer实时发过来的status中的binlog获取;Pumadmin修复自动刷新的bug；修复PumaSyncServer dump时file size查询的bug