Merge pull request #4 from prstcsnpr/master

修改了2个Bug
Bug1：客户端配置得不到很好的变更
Bug2：服务端的client set只会有一个client proxy
Merge pull request #5 from prstcsnpr/master

hashcode做为key本向会产生冲突，改成各DB要素拼成的String为Key
原先程序不读取db的配置，现在加上
Merge branch 'master' of https://github.com/prstcsnpr/dbpool into zn
Merge branch 'bbc'
add a thread to push data to clients and check if the client is alive
every 60 * 20 seconds