* Move development docker-compose file to the main directory

This requires us to move some other files around, like the pullpreview and example docker-compose file for production
setups. This commit also does some housekeeping, like removing some old files and deduping configuration.

* Updated to selenium grid

* Fix in-Docker Selenium tests

The Selenium tests now run inside a Docker Chrome Container. Backwards compatability with non-docker setups is not
guaranteed, though it should not be hard to implement with a couple of small fixes.

* Updated docker development documentation

* Improved test timings, changed the documentation

* Updated docker testing again

* Run npm in the frontend directory

* Really run npm in the frontend directory

* Also run npm in frontend when setting up travis cache

* Change directory for one command only

* Change default test driver name

* CI test change fixes

* Fixed syntax error

* Added dev check

* Trying to fix firefox resizing

* Trying to get tests running

* Stop resizing firefox

* Fixed apple icon spec

* fix host in url helpers for omniauth spec

* Fix omniauth specs

* Fix docs

* Small fixes to docker tests

* Added package.json back in

* Change env variables

Co-authored-by: Markus Kahl <machisuji@gmail.com>