Merge pull request #484 from sappo/master

Problem: WError error on macosx because NAN is a float

cJSON.c

@@ -106,7 +106,7 @@
 {
     if (!cJSON_IsNumber(item)) 
     {
-        return NAN;
+        return (double) NAN;
     }
 
     return item->valuedouble;