MString now string builds with << operator.

MString.h

@@ -75,7 +75,13 @@ namespace coreutils {
       ///
 
       MString& operator<<(const char *value);     
-      
+
+      MString& operator<<(const int value);     
+
+      MString& operator<<(coreutils::ZString &zstring);     
+
+      MString& operator<<(std::string value);     
+
       ///
       ///
       ///