Add complete browser testing suite

[balupton]

Currently browser testing is performed manually. Certain things like displaying errors accordingly differ based on browser vs console (console reporter outputs them on suite or test finish if browser, can't remember which one, as well as exit). Colours should differ based on browser vs console. Exit may or may not run in browser setups (was the case pre taskgroup v5, unsure if is still an occurrence with taskgroup v5).