release in sync with jdk9b175

Improve external plugins support
Upgrade JUnit 5 plugin

release in sync with jdk9b167

• a new external plugin architecture
• a new tester plugin (JUnit 5) by Christian Stein

minor release mostly for TravisCI

please the TravisCI god (take 2)

Realease in sync with b165

A bunch of fix thank to Christian Stein + update to jdk9 b165

Release in sync with jdk 9 b160

Just a refresh release in sync with jdk 9 b160.

Release in sync with jdk 9 b149

A lot of things are still in flux but at least there is a small tutorial now