Attempted fix for issue #190

These two methods on NSURL,
```objective-c
- (NSString *)absoluteString
```
and
```objective-c
- (NSString *)path
```
return different values. According to the docs, `path` is "suitable for input into methods of NSFileManager or NSPathUtilities", whereas `absoluteString` is not.

I don't have a copy of Snow Leopard handy, so someone will have to confirm this path does indeed fix #190 before merging.