Remove POC code

There is some POC code that has been recently enabled and has now proven the concept.

Currently it sets a lot of PRs to "pending" with a test message (and 404 link), removing the Travis results.

We should

* Store the Travis test result and display it "somewhere".
* Add a meaningful, project based, message and link.

Example: https://github.com/joomla/joomla-cms/pull/4021