Use monocle for testing

[micheljung]

Currently, our UI-related unit tests render on the developer's screen. We should run them in "headless" mode however. Apparently, this can be done by using Monocle - just pass some command line options (they say). However, we should be able to set these without having the developer specifying command line options for every test he runs.

Tasks:

1. Test if Monocle works
2. Find out if we can set it using System.setProperty(); (probably before any JavaFX is loaded)
3. If not, see if there's another way

Resources:

https://ustesis.wordpress.com/2014/04/23/headless-ui-testing-with-testfx-and-javafx-8/

http://stackoverflow.com/questions/29116819/javafx-maven-testfx-monocle-dont-work-together

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