Added missing iostream includes

src/game_initialization/configure_engine.cpp

@@ -7,6 +7,7 @@
 #include <boost/foreach.hpp>
 #include <cassert>
 #include <sstream>
+#include <iostream>
 
 namespace ng {
 

src/halo.cpp

@@ -25,6 +25,8 @@
 #include "halo.hpp"
 #include "serialization/string_utils.hpp"
 
+#include <iostream>
+
 namespace halo
 {