function zerosnd( shape ) {
	return fillednd( 0.0, shape );
}
Returns a zero-filled n-dimensional nested array.

@param {NonNegativeIntegerArray} shape - array shape
@returns {Array} filled array

@example
var out = zerosnd( [ 3 ] );
// returns [ 0.0, 0.0, 0.0 ]

@example
var out = zerosnd( [ 1, 3 ] );
// returns [ [ 0.0, 0.0, 0.0 ] ]