Added unwrapping of the jquery encapsulated $document variable

See
http://www.bennadel.com/blog/2630-accessing-document-properties-in-angularjs.htm

Author: Sebastian Gronewold

angular-local-storage.js

@@ -75,6 +75,10 @@ angularLocalStorage.provider('localStorageService', function() {
     // When Angular's $document is not available
     if (!$document) {
       $document = document;
+    } else {
+      // unwrapping the jquery encapsulated document to access cookies
+      // (see http://www.bennadel.com/blog/2630-accessing-document-properties-in-angularjs.htm)
+      $document = $document[0];
     }
 
     // If there is a prefix set in the config lets use that with an appended period for readability