Merge pull request #559 from Chalarangelo/forOwn

[FEATURE][ADD] Add forOwn and forOwnRight

snippets/forOwn.md

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+### forOwn
+
+Iterates over all own properties of an object, running a callback for each one.
+
+Use `Object.keys(obj)` to get all the properties of the object, `Array.forEach()` to run the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.
+
+```js
+const forOwn = (obj, fn) => Object.keys(obj).forEach(key => fn(obj[key],key,obj));
+```
+
+```js
+forOwn({foo: 'bar', a: 1}, v => console.log(v)); // 'bar', 1
+```

snippets/forOwnRight.md

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+### forOwnRight
+
+Iterates over all own properties of an object in reverse, running a callback for each one.
+
+Use `Object.keys(obj)` to get all the properties of the object, `Array.reverse()` to reverse their order and `Array.forEach()` to run the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.
+
+```js
+const forOwnRight = (obj, fn) => Object.keys(obj).reverse().forEach(key => fn(obj[key],key,obj));
+```
+
+```js
+forOwnRight({foo: 'bar', a: 1}, v => console.log(v)); // 1, 'bar'
+```