code: function addSubview(subview) {
  	debug('add subview `%s`', this.toString());
  	if(_.isUndefined(this.subviews)) {
  		this.subviews = [];
  	}
  
  	subview.parentView = this;
  	this.subviews.push(subview);
  }
docs: Function: addSubview
  Adds a Barefoot.View as subview of this view. Sets the parentView property
  of the subview to this view.
  
  Parameters:
  (Barefoot.View) subview - <Barefoot.View> to add as subview to this view