Specifically:

* zmq_event_t should not be used internally in libzmq, it was
  meant to be an outward facing structure.

* In 4.x, zmq_event_t does not correspond to monitor events, so
  I removed the structure entirely.

* man page for zmq_socket_monitor is incomplete and the example
  code was particularly nasty.

* test_monitor.cpp needed rewriting, it was not clean.

Fix windows non-unicode build

update ZMQ_STREAM docs about connection notification

Also the portion about how to close a connection does not only apply to
servers.

Add gssapi files to msvc, use Windows Unicode APIs.

Fix build issue when missing gssapi

GSSAPI/Kerberos Security Mechanism

For exchanging tokens.

E.g., both client and server need to produce and process GSSAPI tokens.

Update file tools versioning in VS projects.

Conflicts:
	builds/msvc/vs2010/inproc_lat/inproc_lat.props
	builds/msvc/vs2010/inproc_thr/inproc_thr.props
	builds/msvc/vs2010/libsodium.import.props
	builds/msvc/vs2010/libzmq.import.props
	builds/msvc/vs2010/libzmq/libzmq.props
	builds/msvc/vs2010/local_lat/local_lat.props
	builds/msvc/vs2010/local_thr/local_thr.props
	builds/msvc/vs2010/properties/Common.props
	builds/msvc/vs2010/properties/Console.props
	builds/msvc/vs2010/properties/ConsoleDebugDynamic.props
	builds/msvc/vs2010/properties/ConsoleDebugLinkTimeCodeGeneration.props
	builds/msvc/vs2010/properties/ConsoleDebugStatic.props
	builds/msvc/vs2010/properties/ConsoleReleaseDynamic.props
	builds/msvc/vs2010/properties/ConsoleReleaseLinkTimeCodeGeneration.props
	builds/msvc/vs2010/properties/ConsoleReleaseStatic.props
	builds/msvc/vs2010/properties/Debug.props
	builds/msvc/vs2010/properties/Dynamic.props
	builds/msvc/vs2010/properties/DynamicDebug.props
	builds/msvc/vs2010/properties/DynamicRelease.props
	builds/msvc/vs2010/properties/LinkTimeCodeGeneration.props
	builds/msvc/vs2010/properties/Release.props
	builds/msvc/vs2010/properties/Static.props
	builds/msvc/vs2010/properties/StaticDebug.props
	builds/msvc/vs2010/properties/StaticDebugLinkTimeCodeGeneration.props
	builds/msvc/vs2010/properties/StaticLinkTimeCodeGeneration.props
	builds/msvc/vs2010/properties/StaticRelease.props
	builds/msvc/vs2010/properties/StaticReleaseLinkTimeCodeGeneration.props
	builds/msvc/vs2010/properties/Win32.props
	builds/msvc/vs2010/properties/x64.props
	builds/msvc/vs2010/remote_lat/remote_lat.props
	builds/msvc/vs2010/remote_thr/remote_thr.props

Fixed mingw poll detection