GPII-455: Added framework functions (and example) for testing with the online flowmanager (running locally)

Added functions to the acceptance testing framework to allow easily writing tests for the online flowmanager.. Created an example testcase (with the gnome keyboard settings).

Note that this pull request extends the work done in https://github.com/GPII/universal/pull/212

NOTE that this pull request depends on a change in the kettle testing framework, namely that of passing through a parameter via the http.send function. I'm not particularly happy with this approach - but couldn't figure out how else to pass the 'expected' value for the unit test to the listener function called when the http request returns. I'd love to get some input on an alternative approach (or an ok for the current approach): https://github.com/kaspermarkus/kettle/compare/fluid-project:master...GPII-455?expand=1