Backport for LIBZMQ-541 fix
Rewrite TestConnectDelay
Close inproc socket pairs on zmq_disconnect

This patch fixes LIBZMQ-476 and LIBZMQ-475
support ZMQ_DELAY_ATTACH_ON_CONNECT socket option
Possible fix for a memory leak in Poller.fd_table.
Merge pull request #98 from miniway/master

Possible fix for a memory leak in Poller.fd_table.