When building with Travis, there are a couple of things we should fix:

• the first install goal is generating the javadoc: this is useless as we just want to install the dependencies and it should be done later in the real build
• the build does not use Central but the JBoss repository. This is weird as it should use Central first. We fix it by tuning settings-example.xml to use the Google Maven Central mirror.
• the build currently uses an old version of Java 8 as it does not use the new JDK installed but the default Travis one. We can fix it by removing the installation of the default Travis one.