pre-QUnit 1.15

@156664d shouldn't be merged. 

We're going to release QUnit 1.15 and there're some changes that we also need shared work.

First one was @8c652e1 where it was needed to remove an extra fixture cleanup.

The last commit address a conflict between document height and the reporter results. The html reporter now print results on each done assertion, instead of a stacked list after each test block.

Edit: intention is to get everything reviewed before QUnit 1.15 release.