Create a binding for zmq_msg_gets.

Additionally, I've changed some tabs to spaces and remove trailing
spaces.

Author: 0mp

zmq.hpp

@@ -71,8 +71,8 @@
         #define ZMQ_DELETED_FUNCTION
     #endif
 #elif defined(_MSC_VER) && (_MSC_VER >= 1900)
-	#define ZMQ_HAS_RVALUE_REFS
-	#define ZMQ_DELETED_FUNCTION = delete
+    #define ZMQ_HAS_RVALUE_REFS
+    #define ZMQ_DELETED_FUNCTION = delete
 #elif defined(_MSC_VER) && (_MSC_VER >= 1600)
     #define ZMQ_HAS_RVALUE_REFS
     #define ZMQ_DELETED_FUNCTION
@@ -124,10 +124,10 @@ namespace zmq
             return zmq_strerror (errnum);
         }
 #else
-		virtual const char *what() const throw ()
-		{
-			return zmq_strerror(errnum);
-		}
+        virtual const char *what() const throw ()
+        {
+            return zmq_strerror(errnum);
+        }
 #endif
         int num () const
         {
@@ -177,7 +177,7 @@ namespace zmq
         if (rc != 0)
             throw error_t ();
     }
-    
+
 #ifdef ZMQ_HAS_PROXY_STEERABLE
     inline void proxy_steerable (void *frontend, void *backend, void *capture, void *control)
     {
@@ -186,7 +186,7 @@ namespace zmq
             throw error_t ();
     }
 #endif
-    
+
     inline void version (int *major_, int *minor_, int *patch_)
     {
         zmq_version (major_, minor_, patch_);
@@ -372,6 +372,14 @@ namespace zmq
             return a == b;
         }
 
+        inline const char* gets(const char *property_) const
+        {
+            const char* value = zmq_msg_gets (&msg, property);
+            if (value == NULL)
+                throw error_t ();
+            return value;
+        }
+
     private:
         //  The underlying message
         zmq_msg_t msg;
@@ -611,7 +619,7 @@ namespace zmq
         {
             return(ptr != NULL);
         }
-        
+
         inline size_t send (const void *buf_, size_t len_, int flags_ = 0)
         {
             int nbytes = zmq_send (ptr, buf_, len_, flags_);
@@ -664,7 +672,7 @@ namespace zmq
                 return false;
             throw error_t ();
         }
-        
+
     private:
         inline void init(context_t& context_, int type_)
         {
@@ -704,9 +712,9 @@ namespace zmq
 
             rc = zmq_connect (s, addr_);
             assert (rc == 0);
-            
+
             on_monitor_started();
-            
+
             while (true) {
                 zmq_msg_t eventMsg;
                 zmq_msg_init (&eventMsg);
@@ -723,7 +731,7 @@ namespace zmq
 #else
                 zmq_event_t* event = static_cast<zmq_event_t*>(zmq_msg_data(&eventMsg));
 #endif
-                
+
 #ifdef ZMQ_NEW_MONITOR_EVENT_LAYOUT
                 zmq_msg_t addrMsg;
                 zmq_msg_init (&addrMsg);