function onesnd( shape ) {
	return fillednd( 1.0, shape );
}
Returns an n-dimensional nested array filled with ones.

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

@example
var out = onesnd( [ 3 ] );
// returns [ 1.0, 1.0, 1.0 ]

@example
var out = onesnd( [ 1, 3 ] );
// returns [ [ 1.0, 1.0, 1.0 ] ]