zsock_resolve return NULL if self is a socket descriptor
Add support for socket descriptors on windows.
events was not getting set on non WIN32 platforms.
zsock_resolve fd support on osx
zpoller fd support on osx
Unit test for fd support in zsock_resolve
Fix typo
zpoller fd support test
Merge branch 'master' into zpoller_fd_support
Merge branch 'msvc_build_fixes' into zpoller_fd_support
Cleanup according to CLASS
Update zsock_resolve docs
zdir: use S_ISDIR macro instead of masking yourself
Bring back zring_node_t
Add ztimeout class
Merge pull request #672 from Q-Leap-Networks/pull-zdir-isdir

zdir: use S_ISDIR macro instead of masking yourself
Problem: Can't install due to missing czmq.7

Solution: Changing name part in docs/czmq.txt from CZMQ back to czmq.
Currently asciidoc thinks that man page should be named CZMQ.7 and
installer searches for czmq.7. Options are either rename the man page
back or change makefile to expect CZMQ.7. Personally I would expect
lowercase names for man page (and it is referenced like that several
times), so changing to lowercase.
Merge pull request #671 from evoskuil/master

Fix MSVC build breaks and update NuGet package.
Merge pull request #673 from Q-Leap-Networks/pull-ztimeout

Pull ztimeout
Merge pull request #674 from miska/master

Problem: Can't install due to missing czmq.7