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Yoann Rodière updated an issue

> Do you have information about this? AFAIK the trusty environment is still in beta and is the most recent Linux OS we can have. We are totally bleeding edge .

You're right. Trusty, released in 2014, is the most recent version available on Travis. And Yes, it's still in beta... I hoped to use Xenial, but it's been released in 2016, so I guess we'll have to wait a couple years still

> I think most people still use the Oracle JDK so I would prefer keeping the tests running on it.

Yes, Oracle's JDK is still the most popular one, so we probably should keep it in our own CI, at least as a separate build.
But the Travis builds are only used for our PR/dev builds, and there are no major differences between OpenJDK and Oracle's JDK anymore. So, in this particular case, I would say the risk is low enough.

Change By:	Yoann Rodière

1. The pre-build step that fetches dependency should simply use the `dependency:resolve` goal. This will avoid the execution of checkstyle, which then will be done in the actual build step (not the "intstall" step). And hopefully, then we'll get detailed logs about what checkstyle rules failed (since the actual build is not executed in silent mode).
2. The "install" goal should only be executed on the build-config project (to install checkstyle rules)
3. We should exclude the artifacts installed as part of our builds from the cache
4. - Upgrade to a more recent version of ubuntu? - => No, Trusty is already the most recent version available on Travis
5. Maybe use OpenJDK instead of OracleJDK? I've heard from Remi Forax (OpenJDK developper) that there's almost no difference between the two in JDK8 (only font rendering), and none at all starting from JDK9. That's because Oracle sells their additions instead of including them in their general public JDK.

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