Revert "Fixes rootElement to match that of this.$()[0] (#121)"

[cibernox]

This reverts commit 6300642.

[Turbo87]

is there a discussion somewhere that discusses why this was reverted?

[pixelhandler]

@Turbo87 my guess is that there was not a good way to over-ride what the addon sets as the root element, e.g. config sets rootElement: '#ember-testing' or something different, but the addon wants to use the first child as the root to match this.$()[0] which is rootElement: '#ember-testing > .ember-view'

Perhaps this RFC addresses a better solution, emberjs/rfcs#280 rendered

[cibernox]

I reverted it mostly because it was causing issues in addons that used ember-basic-dropdown, like EPS. The reason is that, in testing, the target of the wormhole is #ember-testing, but since this change the root was #ember-testing > .ember-view.
That cause that find/findAll could not find wormholed content.

I still think that this should be done, but I wanted to adapt ember-basic-dropdown first.
For that I made a fix in ember-wormhole, but it's not yet enough, because we can't reference wormhole destination by complex selectors, it only accepts IDs.

I proposed to add querySelector/querySelectorAll to simple-dom (ember-fastboot/simple-dom#53) but I don't have a response yet.

And on top of that, yesterday I made the RFC that proposes to remove the .ember-view wrapper on tests, so this might not even be necessary soon.