linking fd to pipe identity via socket option
Update mechanism API so we can check for ERROR status
Update gssapi mechanism
Merge pull request #1012 from hurtonm/master

Update mechanism API so we can check for ERROR status
Consolidate VS props to shared location.
Rename VS version resource file.
Integrate GSSAPI option in VS UI options and props.
Update VS 2008/10/12/13 file distribution.
Merge pull request #1014 from evoskuil/master

Integrate GSSAPI option in VS UI options and props.
NULL: Implement ERROR handling

NULL mechanism sends ERROR command rather than READY command when ZAP
handler rejects the ZAP request (status code != "200"). The body of
ERROR command contains the status code as returned by ZAP handler.
Merge pull request #1016 from hurtonm/master

NULL: Implement ERROR handling
initialize libsodium and tweetnacl
find libsodium with cmake
removed return code check for now, got -1 in test_security_curve.
ws
Merge pull request #1018 from soundart/master

curve: initialize crypto libs before usage
Issue #1017: add ZMQ_HANDSHAKE_IVL time limit on connection handshake
Merge pull request #1019 from willstrang/master

Issue #1017: add ZMQ_HANDSHAKE_IVL time limit on connection handshake
Add failing test reproducing issue #1015.

There is a race condition when connect and bind on a new inproc
endpoint happen "simultaneously" in threads.  Causes the error:
  Assertion failed: ok (ctx.cpp:474)
Mark failing test for issue #1015 as XFAIL