Changes between 4.8.0 and 4.9.0.RC1

This is a pre-release for 4.9.0, a maintenance release with 2 new features and a bug fix. All users of the 4.x.x and 3.6.x series are encouraged to test this version.

Add traffic listener

GitHub issue: #411

Connection recovery runs into timeouts when using NIO

GitHub issue: #413

Provide factories to create NIO artefacts

GitHub issue: #410