warning fix: close() needs unistd.h.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
warning fix: buf is uint8_t*, so use unsigned.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Fix typos.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Addauthor to nanomsg(7) man page

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>