Merge pull request #71 from wtfzdotnet/issue-59

Updating the DiscoverMoviesQuery object to support all the new filters.

Author: wtfzdotnet

lib/Tmdb/Model/Collection/Genres.php

@@ -51,10 +51,13 @@ public function getGenre($id)
     /**
      * Add a genre to the collection
      *
-     * @param Genre $genre
+     * @param  Genre $genre
+     * @return $this
      */
     public function addGenre(Genre $genre)
     {
         $this->data[] = $genre;
+
+        return $this;
     }
 }