Refactor utils and organize routes/schema

utils/array.js

@@ -0,0 +1,9 @@
+// removeValue(array, item) remove item from the array
+function removeValue(array, item) {
+    var index = array.indexOf(item);
+    if (index !== -1) {
+        array.splice(index, 1);
+    }
+}
+
+module.exports.removeValue = removeValue;