SPDY: port SpdySessionHandler to netty 4
Fix sendNumbers logic
Use Unpooled to allocate buffer in Base64
Add missing closing paren
[maven-release-plugin] prepare release netty-4.0.1.Final
[maven-release-plugin] prepare for next development iteration
Do not close ServerChannel on IOException while accepting an incoming connection

.. so that we can recover from 'too many open files'

- Fixes #1578
Modify HttpContentDecoder to writeInbound and readInbound from its internal decoder