Updated tests to be more efficient

The tests were / are being made slow by a long pause on the `renderHtml5` test. This is not a problem with the test itself - but rather a [known problem](https://github.com/jackalope/jackalope-jackrabbit/issues/96) with Jackrabbit.

I have split the tests into groups and we execute them (sequentially) in different processes.
What do these annotations do?