lightening aura - Add or remove style to the component in the controller/helper JS

Following snippets will describe the steps

	-------JS Code------
	var aura_id = "error-info";
	var ele = component.find(aura_id);
	$A.util.removeClass(ele, "error-info-display-none");
	//for adding a style class use method - addClass
	-------CSS code------
	.THIS .error-info-display-none {
	display: none;
	}
	--------CMP Code------
	<div aura:id="error-info" class="error-info-display-none" role="alert" >
	Error Message
	</div>

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