Docs for Jackson.toJson().
Have the rendering engine create a buffer instead of receiving one.
Fix Upload task serialization.
Remove no longer needed Slack notification bits.
Introduce Renderable, to make it simpler to render custom types.
Don't need this custom class.
Share the fonts between the Javadoc and manual to avoid another load.
Upgrade Netty version.
Use the epoll channel impl where possible.
Fix the epoll check.
Pull in the actual native lib for the epoll transport.

It's benign if it's the wrong os/arch.
Sync the event loop impl with the channel impl.
Add a toggle for epoll support.

Need to determine whether this is causing the CI instability.
Quick experiment with the next Netty beta snapshot.
Add missing repo for Gradle tests.
Add missing repo for Lazybones tests.
Don't try and build the project when running `./gradlew idea`.
Inline the renderer for markup builder.
lambda.
Support streaming http client responses (#414)