Fix OTA handling bug(Reuploaded)

• Fix a bug handling UDP OTA packets mixed with non-OTA packets.
• Fix link problem.

I forgot to change the version number in the code, but everything else should work fine.
And I recompiled the binary with CGO_ENABLED=0, if you care about those, please redownload the files below.

If encountered any problem, please report.

Support UDP and new methods

Only provide precompiled binaries for Linux server, for now.

• Support UDP relay on server side, and OTA
• Support "aes-[128/192/256]-ctr" encryption method (Thanks for @slurin)
• Support "chacha20-ietf" encryption method (Thanks for @aead)
• Improve performance of "chacha20" encryption method
• Correctly close connection if handshake failed (May fix #176)

If encountered any problem, please report.

Support One Time Auth

Thanks for @ayanamist for implementing this feature.

Download precompiled binaries below.

Support chacha20 and salsa20 encryption method

Please download from http://dl.chenyufei.info/shadowsocks/

• Support "chacha20" encryption method, thanks to @defia
• Support "salsa20" encryption method, thanks to @genzj
• Fix go 1.4 canonical import paths, thanks to @ddatsh
• Exit if port not bindable, thanks to @thomasf
• Always set timeout for data transfer
• More buffer reuse

Fix can't specify encryption method in config file

Please download from http://dl.chenyufei.info/shadowsocks/

• Fix can't specify encryption method in config file

Support new encryption method "rc4-md5"

Please download from http://dl.chenyufei.info/shadowsocks/

• Support new encryption method "rc4-md5"
• Use aes-256-cfb as default encryption method for command line app

Windows server binaries and other small improvements

Please download from http://dl.chenyufei.info/shadowsocks/

• Provide Windows server binaries
• Add -b option to limit listen address for the client
• Fix can't override server address on command line