Be verbose about IRC server connection failures, and handle them properly

src/network/socket_handler.hpp

@@ -2,6 +2,7 @@
 # define SOCKET_HANDLER_INCLUDED
 
 #include <string>
+#include <utility>
 
 typedef int socket_t;
 
@@ -21,7 +22,7 @@ public:
   /**
    * Connect to the remote server, and call on_connected() if this succeeds
    */
-  bool connect(const std::string& address, const std::string& port);
+  std::pair<bool, std::string> connect(const std::string& address, const std::string& port);
   /**
    * Set the pointer to the given Poller, to communicate with it.
    */