Renamed new socket options to be clearer

* ZMQ_REQ_STRICT was negative option (default 1) which goes against
  the standard, where defaults are zero. I renamed this to
  ZMQ_REQ_RELAXED.

* ZMQ_REQ_REQUEST_IDS felt clumsy and describes the technical solution
  rather than the problem/requirement. I changed to ZMQ_REQ_CORRELATE
  which seems more explicit.

Renamed test_connect_delay to test_immediate to match name of option

* The ZMQ_CONNECT_DELAY option was renamed to ZMQ_IMMEDIATE

Testing github jenkins integration

This reverts commit 0640d6d2.

Fix cmake build

Renamed inproc connect test (name was too long)

tests: don't listen on public ports

Reverted pull request 666

This reverts commit bfd472f9.

This reverts commit 1206f457.

curve key names as in libcurve, symetry design, a few logic improvements

Added test case for NULL domains

NULL mechanism was not dealing with ZAP denials properly

Fixed random failures in test_security_plain and _curve

* ZAP handler thread was not getting time to start up
* Code now creates and binds handler socket in parent thread and
  passes the socket to the zap_handler, so this always gets the
  authentication requests.

Fix windows build