Released 1.5

This release contains important API changes that may break existing
code.

1. Incompatible change: `Socket.send` series methods are splitted
to `Socket.send` and `Socket.sendMore` and have more overloads for
common message types like string or empty
2. Remove PollItem duplicate API (#11)
3. Fix compiler warning (#10) and compile failure (#12)
4. Add RTReq example from ZMQ Guide Chapter 3

Scripts/ZeroMQGuideExamples/Chapter2/RRBroker.mq4

@@ -42,8 +42,8 @@ void OnStart()
          do
            {
             frontend.recv(message);
-            more=message.more();
-            backend.send(message,false,more);
+            if(message.more()) backend.sendMore(message);
+            else backend.send(message);
            }
          while(more);
         }
@@ -53,8 +53,8 @@ void OnStart()
          do
            {
             backend.recv(message);
-            more=message.more();
-            frontend.send(message,false,more);
+            if(message.more()) frontend.sendMore(message);
+            else frontend.send(message);
            }
          while(more);
         }

Scripts/ZeroMQGuideExamples/Chapter2/WUProxy.mq4

@@ -38,8 +38,8 @@ void OnStart()
       do
         {
          frontend.recv(message);
-         more=message.more();
-         backend.send(message,false,more);
+         if(message.more()) backend.sendMore(message);
+         else backend.send(message);
         }
       while(more);
      }