[TASK] Run the unit tests on TravisCI

The github repository will be find at https://github.com/typo3-ci/ext-phpunit and the Travis jobs at https://travis-ci.org/typo3-ci/ext-phpunit

Fixes: 49741
Change-Id: Ib3f88f5ba7f0fe76b0f91e507e22141b7fbf2a00