patch 7.4.905

Problem:    Python interface can produce error "vim.message' object has no
            attribute 'isatty'".
Solution:   Add dummy isatty(), readable(), etc. (closes #464)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    905,
 /**/
     904,
 /**/