add skynet.watch for skynet.call, read http://blog.codingnow.com/2013/12/skynet_monitor.html
bugfix: trace switch after recv exit signal
bugfix: remote object support term signal
change name from exit to error
skynet.call capture error
bugfix: message queue support multi parm
bugfix: queue is 8
add comment for message queue
add comment for service client
add keepalive to socket server
remove feature: remote object.  Issue #58
add log for master connecting to harbor
add log for net building
define max client for example
debug stat report boot time
cache lua code load
add skynet.cache lib
bugfix: pop error message when load file not exist
bugfix: monitor exit
use skynet_error for log