add more detail infomation for no datanode error
use UInt to write packet begin, add warn when chid = 0, fixbug for lose config when config server re-config
fixbug for callback undefined err
update version to 0.0.19
add heart beat function
fix bug for heartbeat not auto init
remove console.log
fixbug for heartbeat context, add on('close') event to deal close socket
heatbeat interval added
fix type error when option and callback is both null
fix new instance`s params, optimize heartbeat code
Merge pull request #4 from sunfang1cn/fix_heartbeat_close_bug

fixbug for heartbeat context, add on('close') event to deal close socket
version 0.0.22, update coverage.html
add timeout options,  update readme.md
fixbug for socket timeout less of user defined
Merge pull request #5 from sunfang1cn/options_timeout

add timeout options,  update readme.md
add a version of short link socket
add version number
fix readme
fix readme