function append( arr, list ) {
	var i;
	for ( i = 0; i < list.length; i++ ) {
		arr.push( list[ i ] );
	}
	return arr;
}
Appends a list of elements to a provided array.

@private
@param {Array} arr - array to which to append
@param {Array} list - list of items to append
@returns {Array} input array