VE-1414 Adding test to delete template from an article

Additional work needed to be done here to select the template transclusion node. This is mainly because the transclusion node class is just a wrapper for the template's content, which could be anything that a user creates. The way to achieve the code is to execute custom JQuery code getBoundingRect() to find the template's bounding rectangle's coordinates that is relative from the editing surface.
I was wonder if You could move something like this to separate class e.g VisualEditorContent in ContentPatterns package.