Added ability to supply JSON from standard input

main.cpp

@@ -60,8 +60,18 @@ int main(int argc, char **argv)
 		cfg_filename = argv[1];
 	}
 
-	// Read JSON CFG
-	ok = read_config_json(cfg, cfg_filename);
+	// Read config
+	if ("-" == cfg_filename)
+	{
+		// Read JSON from std input
+		ok = read_config_json(cfg, std::cin);
+	}
+	else
+	{
+		// Read JSON from config file
+		ok = read_config_json(cfg, cfg_filename);
+	}
+
 	if (!ok)
 	{
 		result = -1;