function zeros5d( shape ) {
	return filled5d( 0.0, shape );
}
Returns a zero-filled five-dimensional nested array.

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

@example
var out = zeros5d( [ 1, 1, 1, 1, 3 ] );
// returns [ [ [ [ [ 0.0, 0.0, 0.0 ] ] ] ] ]