Update the zmq project to the latest stable version of zmq-4.X.

This fixes numerous issues on newer linux machines with ZMQ not routing
messages properly.

Projects/win32/zeroMQ.cmake

-
-add_external_project(zeroMQ
-  DEPENDS boost
-  CMAKE_ARGS
-    -DBUILD_SHARED_LIBS=ON
-  )

Projects/zeroMQ.cmake

+
 add_external_project(zeroMQ
-  CONFIGURE_COMMAND <SOURCE_DIR>/configure
-    --enable-shared
-    --disable-static
-    --prefix=<INSTALL_DIR>
-  BUILD_IN_SOURCE 1
-)
+  CMAKE_ARGS
+    -DBUILD_SHARED_LIBS:BOOL=ON
+    -DZMQ_BUILD_FRAMEWORK:BOOL=OFF
+  )

versions.cmake

@@ -130,18 +130,11 @@ add_revision(vxl
   GIT_REPOSITORY "https://github.com/vxl/vxl"
   GIT_TAG 62f6b765b8d902b24177b0c6f60c799c28ac7891)
 
-if (WIN32)
-  #windows uses the custom cmake build of zeroMQ
-  add_revision(zeroMQ
-    GIT_REPOSITORY "https://github.com/robertmaynard/zeromq2-x"
-    GIT_TAG master)
-else()
-  #unix and mac uses the stable release
-  add_revision(zeroMQ
-    URL "http://download.zeromq.org/zeromq-2.2.0.tar.gz"
-    URL_MD5 1b11aae09b19d18276d0717b2ea288f6)
-
-endif()
+#use the tweaked cmake build of zeroMQ
+add_revision(zeroMQ
+   GIT_REPOSITORY "https://github.com/robertmaynard/zeromq4-x.git"
+   GIT_TAG "master"
+   )
 
 #Use master of remus to get fixes for cmb v4
 add_revision(remus