Don't append a colon and two spaces to title in --json output.

Resolves Issue 139.

src/iperf_api.c

@@ -772,8 +772,7 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
 #endif 
                 break;
             case 'T':
-                test->title = malloc(strlen(optarg) + 4);
-		sprintf(test->title, "%s:  ", optarg);
+                test->title = strdup(optarg);
 		client_flag = 1;
                 break;
 	    case 'C':
@@ -2609,7 +2608,7 @@ iprintf(struct iperf_test *test, const char* format, ...)
     int r;
 
     if (test->title)
-        fputs(test->title, stdout);
+        printf("%s:  ", test->title);
     va_start(argp, format);
     r = vprintf(format, argp);
     va_end(argp);