add plain object check and omit helpers

src/helpers/is_plain_object.js

@@ -0,0 +1,3 @@
+export default function (obj) {
+  return (typeof obj === 'object' && !Array.isArray(obj) && obj !== null);
+}

src/helpers/object_omit.js

@@ -0,0 +1,11 @@
+import isPlainObject from './is_plain_object';
+
+export default function (obj, props) {
+  if (!isPlainObject(obj)) return obj;
+  if (!Array.isArray(props)) props = [props];
+
+  const newObj = Object.assign({}, obj);
+
+  props.forEach(prop => delete newObj[prop]);
+  return newObj;
+}