Gelencsér Szabolcs / circlestack

Selenium ✅

Documentation about how to set up test enviroment is on the way. Meanwhile here is the code.

Closes #218

Closes #385

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Update:
A little guide to setup selenium testing enviroment is finally done:
[Road to TestEnv from DevEnv](http://git.ik.bme.hu/circle/cloud/wikis/roadtotestenv)

See merge request !301