Bugs fixed and changes in nio2-b93
- Registry and GNOME based FileTypeDetectors could return badly formed content types
- Files#probeContentType failed with UnsatifiedLinkException if invoked prior to other methods (win only)
- Path#createLink throw UnsupportedOperationException (win xp only)
- Sharing violation accessing attributes of files not opened for shared read access (win only)
- CompletionHandler#completed rather than failed method invoked when I/O operation failed
