Implemented thread signaling using ZMQ.Pair sockets
Added various versions of ZeroMQ/Crossroads.IO include files for reference.
Updated to ZeroMQ 3.1.1b (5ef63318) and mapped functions from zmq_utils.h
Removed EXPERIMENTAL IFDEFs because zmq_device is available in this version.
Added IZeroMQ.PollEmulatedDevice that emulates zemq_device (legacy but useful code)
Added Crossroads IO API Wrapper.
Typo.
ZeroMQ.Wrapper -> ZeroMQ
Added Crossraods.IO wrapper in Delphi OOP
Crossroads.IO seems to be definitely deprecated.
Merged .gitignore files
Updated to ZeroMQ 4.0.1

+ Cleaned-up old ZeroMQ includes
Upgraded ZMQ Guide samples
Fixed several typos
Implemented IZeroMQ.Monitor

* Moved demos out of "ZeroMQ Guide" to their own project group
* Added demos/monitor_socket.dpr based on example provided in zmq_socket_monitor doc (http://api.zeromq.org/4-0:zmq-socket-monitor)