3.14.0-francium

Removing duplicated docker push commands. :: @diemol

Upgrading docker bindings for testing to ver. 3.5.0 (#792) :: @diemol

Managing processes via Supervisor :: @diemol

Adding START_XVFB as a env var to start (or not) Xvfb :: @diemol

3.14.0-francium release :: @diemol

Versions Information:

(upgrades are highlighted)

• Selenium: 3.14.0
• Google Chrome: 69.0.3497.100
• ChromeDriver: 2.42
• Mozilla Firefox: 62.0.3
• GeckoDriver: 0.22.0