Returns or sets attribute value
@param {String} name Attribute name
@param {String} value New attribute value
@returns {String}
function(name, value) {
			if (arguments.length == 2) {
				// modifying attribute
				var ix = _.indexOf(_.pluck(this._attributes, 'name'), name.toLowerCase());
				if (~ix) {
					this._attributes[ix].value = value;
				} else {
					this._attributes.push({
						name: name,
						value: value
					});
				}
			}
			
			return (_.find(this.attributeList(), function(attr) {
				return attr.name == name;
			}) || {}).value;
		}