Two bugfixes and corrected comment. 

Bugfix, `waytemp.nd` is not a struct if `Nnd == 1`, resulting in an error:
```
??? Cell contents reference from a non-cell array object.

Error in ==> parse_osm>parse_way at 78
ndtemp(1, j) = str2double(waytemp.nd{j}.Attributes.ref);
```
etc..