When a ZMQ_STREAM socket connection is broken (intentionally, via `shutdown()`
or accidentally via client crash or network failure), there is no way for the
application to dertermine that it should drop per-connection data (such as
buffers).

This contribution makes sure the application receives a 0-length message to
notify it that the connection has been broken.  This is symmetric with the
process of closing the connection from within the application (where the
application sends a 0-length message to tell ZeroMQ to close the connection).

Conflicts:
	CMakeLists.txt

Define NOMINMAN to fix windows build.

use version-script only for ELF linux

Fix compilation on Windows (MinGW-w64)

Implement socket_base_t::get_credential member function

The get_credential () member function returns
credential for the last peer we received message for.
The idea is that this function is used to implement user-level API.

Only export zmq_* symbols

Fix timestamp counter on s390/s390x

Fixes #811

windows: changed tcp port from glrpc assigned to unassigned one

cmake: fixed error 'install TARGETS given no ARCHIVE DESTINATION'

Replace assert with zmq_assert

Fix some comments regarding method overriding

Make it explicit that the probe function doesn't modify passed message

ZMQ_SRCFD docs and tests

Also moved the fd field from message content to message itself

Simplify ypipe_t and ypipe_base_t template parameters

Allow clients to get remote endpoint per message for TCP connections

This patch allows client applications to retrieve the remote endpoint from a message that originated from a tcp socket

Update test_filter_ipc to not use abstract socket.

This fixes the test on Mac OS X and SmartOS (probably other Solarises).
Also updates the sockets using ipc: to use DEALER sockets instead
of PAIR sockets.

Fix LIBZMQ-576 - Revert "Merge pull request #510 from miniway/master"

This reverts commit f27eb67e, reversing
changes made to a3ae0d4c.

https://zeromq.jira.com/browse/LIBZMQ-576

Conflicts:
	src/stream_engine.cpp

Conflicts were around additional defaults to the constructor after the
'terminating' default.  The additional defaults were left alone, and
the 'terminating' default was removed.

Minor cosmetic fixes

- corporate copyright statements sit in AUTHORS file

- This seems redundant; is there a use case for NOT providing
  the IPC credentials to the ZAP authenticator?

- More, why is IPC authentication done via libzmq instead of ZAP?
  Is it because we're missing the transport type on the ZAP request?

- put into alphabetical order
- there was no consistency in previous ordering