Conflicts:
	src/box/index.m

Conflicts:
	src/CMakeLists.txt

user can throw an exception with choised code.

Conflicts:
	third_party/README

Conflicts:
	third_party/README

Inline bio_socket_close().
Don't allow connect/bind on a non-empty socket:this is error-prone.
Don't allow connect/bind on a socket which
is already connected/bound/used for something else.
This is error-prone.
Move bind_addrinfo to evio layer.
Don't create iobuf without need. In close(), set iobuf to NULL.
Timeouts are not exceptions. Merge _timeout and other calls in coio.

Do not throw exceptions from coeio_connect_addrinfo() if timeout.
Rename box.io to box.socket.