增加rc4 key长度
add log
bugfix: local连接断开立即断开link
no need to write WriteAll, see:
1. https://code.google.com/p/go/source/browse/src/pkg/net/net.go#126
2. https://code.google.com/p/go/source/browse/src/pkg/net/fd_unix.go#307
Merge pull request #2 from Cofyc/writeall

writeall
modify readme
read req & write resp timeout
Merge branch 'master' into xebec-master
fix cache