Update setParent to accept string parameter and use as ID selector

[tiagor87]

Update method setParent to accept ID string as parameter. That way, There is no need to get element in the controller.

Sorry for the indentation, WebStorm updated automatically.

[briboles]

:+1: I would very much like this pulled into master and released. Having to call document to get element in the controller makes one more item I have to stub in unit tests. :-)