Update release notes
Upgrade to AirBase 5
hardcode airlift versions in pom

They can be hardcoded just fine, the release plugin will pick these up and replace them correctly.
make the invoker plugin pick up the oss-release profile correctly. Change the
archetype code to actually have the profile (from airbase) and therefore sign
the generated artifacts correctly for upload to OSS.
[maven-release-plugin] prepare release 0.72
[maven-release-plugin] prepare for next development iteration
Add request state information AsyncHttpClient for debugging

Cancel http request if an error occurs while sendin the request
Manage http client thread pools better

- Make number of boss and worker threads for netty configurable
- Make the threads in the various pools contain the prefix of the httpclient module config
Notify callback handler when an error occurs
Update news and changes for release
[maven-release-plugin] prepare release 0.73
[maven-release-plugin] prepare for next development iteration
Remove experimental from all artifact names