function copy( x, N, out, stride, offset ) {
	var i;
	for ( i = 0; i < N; i++ ) {
		out[ offset ] = x[ i ];
		offset += stride;
	}
}
Copies a specified number of array elements to a provided array.

@private
@param {Array} x - input array
@param {NonNegativeInteger} N - number of elements to copy
@param {Collection} out - output array
@param {integer} stride - output array stride
@param {NonNegativeInteger} offset - output array offset

@example
var x = [ 1, 2, 3, 4 ];

var out = [ 0, 0, 0 ];
copy( x, 3, out, 1, 0 );

var o = out;
// returns [ 1, 2, 3 ]