Update README

There is no ```server.Start()``` function defined. Simply call ```server.Handle()``` function will launch the server.
fix server_test data race bug
Merge pull request #3 from reterVision/patch-1

Update README
Merge pull request #4 from yourihua/master

fix server_test data race bug
edit README;
Merge branch 'master' of https://github.com/funny/link
improve session API
public the send packet API.
make session always need to started by manual
refactor broadcast API
refactor sync.Mutext usage and remove unused field
fix set write deadline bug
improve Session API
improve protocol setting
fix examples/broadcast bug
Merge pull request #5 from yourihua/master

fix examples/broadcast bug
channel broadcast API fix
Merge branch 'master' of https://github.com/funny/link
fix bug
rename