Solution: fix documentation

Problem: missing tests and inconsistent behaviour for ZAP corner cases

Solution: added tests

mechanisms

Solution: uniformly require a ZAP domain to be set to activate ZAP
handling, clarify comment on Stonehouse pattern

Solution: added test & some improvements of test utils

Solution: emit events as expected by tests, and refuse connections when
ZAP is required but no handler started

Addresses #2711 partially

Solution: added test case for NULL/PLAIN/CURVE

Problem: CentOS 6 build fails

Solution: use same autoconf workaround as for Debian 7, and manually
create the config directory

Update AUTHERS File

RELICENSE: Google, Inc.

Relevant commits: ddb82a54, 68f5926e

Also adds AUTHORS entry that should have been part of the previous commits.

Problem: duplicated socket_poller::wait() code

zmq::socket_poller_t::wait() had an important set of common lines
between POLL and SELECT variant.

Solution: refactor zmq::socket_poller_t::wait() and add the
following methods:

zmq::socket_poller_t::zero_trail_events()
zmq::socket_poller_t::check_events()
zmq::socket_poller_t::adjust_timeout()
Signed-off-by: Marc Sune <mardevel@gmail.com>

Revert "Problem: term "identity" is confusing"

Problem: term "identity" is confusing

Solution: use "routing_id" instead

Solution: Replaced by "routing id"

Solution: change docs to refer to "Routing id"

Solution: Renamed, but support querying the property by its old name

Solution: Replaced by "routing_id"

Solution: renamed routing_id fields in pipe_t, renamed ZMQ_CONNECT_RID to ZMQ_CONNECT_ROUTING_ID

Solution: replace by "routing id"

Problems: typos in proxy_steerable stats

Solution: fix it

Solution: fix it

Problem: proxy_steerable STATISTICS returns conflated buffers

Solution: split each stat into its own frame, to make it simpler and
easier to use it, especially from high level bindings

Problems: proxy stats test break 32bit build, not declared as draft

Solution: ifdef it until it's declared stable

Solution: trucate 64 bit stats in test_proxy, as it's much easier than
to try and print 64 unsigned integers in a portable way

* Issue #2736: Add STATISTICS command to zmq_proxy_steerable()

Variable is assigned but is not used until the end of the function

Excessive check options.mechanism == ZMQ_NULL

The '||' operator is surrounded by opposite expressions. session_base.cpp 377

Problems: compiler warnings

Solution: add /* FALLTHROUGH */ comments so that nagging compilers
don't nag