CI: Configure project for gitlab

* use headless Chromium as the browser for selenium and karma tests
* make database host configurable for developer setting
* add .gitlab-ci.yml
* remove .travis.yml

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
2 jobs for <span class="ref-name">gitlab-ci-test</span> in 8 minutes and 27 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #2913
test

00:08:27

canceled #2912
test

00:00:05