added _.forOwn definitions

lodash/lodash-tests.ts

@@ -570,6 +570,10 @@ _.forInRight(new Dog('Dagny'), function(value, key) {
   console.log(key);
 });
 
+_.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
+  console.log(key);
+});
+
 var mergeNames = {
   'stooges': [
     { 'name': 'moe' },

lodash/lodash.d.ts

@@ -2290,6 +2290,20 @@ declare module _ {
 		callback?: ObjectIterator<T, void>,
 		thisArg?: any): Dictionary<T>;
 
+	/**
+	* Iterates over own enumerable properties of an object, executing the callback for each 
+	* property. The callback is bound to thisArg and invoked with three arguments; (value, key, 
+	* object). Callbacks may exit iteration early by explicitly returning false.
+	* @param object The object to iterate over.
+	* @param callback The function called per iteration.
+	* @param thisArg The this binding of callback.
+	* @return object
+	**/
+	export function forOwn<T extends {}>(
+		object: Dictionary<T>,
+		callback?: ObjectIterator<T, void>,
+		thisArg?: any): Dictionary<T>;
+
 
 	/**
 	* Recursively merges own enumerable properties of the source object(s), that don't resolve