netty/netty — pull request #1365 by kxbmap (2013-05-16 03:17:43+00:00)
Title: Add lengthAdjustment option to LengthFieldPrepender

Because I want to write as follows:
```scala
ch.pipeline()
.addLast("framer", new LengthFieldBasedFrameDecoder(17, 0, 1, 1, 1))
.addLast("prepender", new LengthFieldPrepender(1, -1))
.addLast("decoder", new FooDecoder())
.addLast("encoder", new FooEncoder())
.addLast("handler", new FooHandler())
```
This pipeline can communicate 1 to 16 bytes data.