The example test suite should be as simple as possible

[mvysny]

The ParallelTest and the Hub thingy is super-confusing to the initial learners of TestBench:

1. Don't use isHub or anything like that - it's not clear what value it provides to the programmer
2. Don't use parallelism: launching 6 browsers at a time is super-confusing at first. That is the first thing the user disables.

The MainTestIT and the AbstractViewTest should be as simple as possible. Simply extend from TestBenchTestCase instead of ParallelTest. It could be valuable to mention the ParallelTest in the javadoc somewhere, but let's not use it straight from the beginning.