add worker dispatch weight
socket id can't be less then 0
gate support TCP_NODELAY
update history
add skynet.queue
bugfix: socket channel
bugfix: Issue #133
update readme
add socket.limit for defence
improve cluster
fix typo
bugfix: skynet.exit redirect error, and add datacenter.wait
update history
skynet.localname return nil when the name not exist
bugfix: skynet.localname return nil not 0
release 0.4.2
Merge pull request #135 from cloudwu/dev

release v0.4.2
Merge pull request #6 from cloudwu/master

20140714