Only export zmq_* symbols
Fix timestamp counter on s390/s390x

Fixes #811
Merge pull request #818 from Debian/s390x

Fix timestamp counter on s390/s390x
Merge pull request #817 from Debian/symbols

Only export zmq_* symbols
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.
Merge pull request #819 from hurtonm/master

Implement socket_base_t::get_credential member function
Fix compilation on MinGW-w64
Merge pull request #820 from jtanx/win32

Fix compilation on Windows (MinGW-w64)
use version-script only for ELF linux
Merge pull request #821 from davipt/master

use version-script only for ELF linux
Define NOMINMAN to fix windows build.
Merge pull request #823 from ricnewton/master

Define NOMINMAN to fix windows build.
Adds support for detecting ZMQ_STREAM disconnections.

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
Fixes CMake build after ZAP test file was deleted.

File was removed in 5bf96f64b07ff74548495fdf38198a9cc8edb662 a few days ago.
Merge pull request #824 from AndreLouisCaron/fix-cmake-build

Fixes CMake build after ZAP test file was deleted.
Merge pull request #825 from AndreLouisCaron/disconnect-notifications

Adds support for detecting ZMQ_STREAM disconnections.
Corrects ypipe initialization when conflate is NOT enabled.

Fixes LIBZMQ-584
Update pipe.cpp
Merge pull request #827 from EricMCornelius/master

Corrects ypipe initialization when conflate is NOT enabled.