Added test for parser rules, adding classes

Relates to https://github.com/Waxolunist/bootstrap3-wysihtml5-bower/issues/82

When setting parserRules to add classes, those are not inserted immediately. If a change_view happens for instance, the class of the parser rule is applied. I don't have a solution for this atm, but I have written some tests for it.

You can merge them in, and comment em out, but you have at least the tests for it.