doc: zmq_msg_init does not set errno

In fact it always returns zero.

Problem: wrong default VC rt lib for release dynamic exe.

fix CMP0053 warning with cmake 3.1

fix cmake build system

Allow zmq_msg_gets checks to assert rather than segfault

Adjust number of sent messages on hiccups

Not adjusting the sent message count may lead to situation when SUB
socket does not forward its subscriptions.

resolve #1347 addresses issue of no metadata on identity frame

Support limited metadata for STREAM sockets

Fix autogen.sh warning about trailing whitespace

Fix error return for clock_gettime.

Problem: build break in OSX, VS2010, VS2012

thread safety bug - lock when sending

Revert "Bzimmerman cmake"

problem: client and server sockets are not thread safe

Problem: VS projects missing client/server.