sp_ep_close has no return value

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
linger option queried by transport, not supplied by the core

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

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Several references in documentation changed to links.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
sp_recv(3) man page fixed

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
Merge branch 'master' of github.com:250bpm/nanomsg