feat(filterFilter): support deeply nested predicate objects

Due to 339a165, it became impossible to filter nested properties of an object using the filterFilter.
A proposed solution to this was to enable the use of nested predicate objects. This change enables the
use of these nested predicate objects.

Example:

```html
<div ng-repeat="it in items | filter:{ address: { country: 'Canuckistan'}}"></div>
```

Or

```js
$filter('filter')(items, { address: { country: 'Canuckistan' } });
```

Closes #6215
Related to #6009

1 files changed, 2 insertions, 1 deletions

diff --git a/src/Angular.js b/src/Angular.js
index 9811c363..e9d1de88 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -81,6 +81,7 @@
     -assertNotHasOwnProperty,
     -getter,
     -getBlockElements,
+    -hasOwnProperty,
 
 */
 
@@ -96,7 +97,7 @@
  * @returns {string} Lowercased string.
  */
 var lowercase = function(string){return isString(string) ? string.toLowerCase() : string;};
-
+var hasOwnProperty = Object.prototype.hasOwnProperty;
 
 /**
  * @ngdoc function