Create new fixture container on cleanup

[hdodov]

I noticed that the cleanup() method simply empties the fixture.el element. Wouldn't it make more sense to create a completely new container instead? In my case, the fixture container ends up with some state data that I don't want to remain for the rest of the tests.

I changed this line to this:

return this.el = document.createElement('div')

And it seems to work great. I don't see a reason to share the fixture container between tests.