Issue #2924324: Use selenium chrome docker image for tests (#438)

* use selenium docker image for local tests

* use selenium docker image on travis

* fix doc

* use the right script

* Add port

* Add net host

* Remove selenium cache dir

* remove trailing quote

* should fix crashes, see https://code.google.com/p/chromium/issues/detail?id=519952

* MOunt volume including test fixtures into selenium docker, update actual test and documentation accourdingly

* remove google-chrome-stable apt package

* try without mounting dev/shm

* Revert "try without mounting dev/shm"

This reverts commit 0d80b69c32502f97b1068b73d7715c73c849f481.

* Adjust travis