remove util submod

src/macros.rs

@@ -0,0 +1,10 @@
+#[macro_export]
+macro_rules! map(
+    { $($key:expr => $value:expr),* } => {
+        {
+            let mut m = ::std::collections::HashMap::new();
+            $(m.insert($key, $value);)+
+            m
+        }
+     };
+);