Allow for request params in delete by query calls

Delete by query calls allows for optional request params to tune things
like routing, replication and consistency.

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/docs-delete-by-query.html#delete-by-query-parameters

lib/Elastica/Type.php

@@ -440,19 +440,21 @@ public function deleteIds(array $ids)
     /**
      * Deletes entries in the db based on a query
      *
-     * @param  \Elastica\Query|string $query Query object
+     * @param  \Elastica\Query|string $query   Query object
+     * @param  array                  $options Optional params
      * @return \Elastica\Response
      * @link http://www.elasticsearch.org/guide/reference/api/delete-by-query.html
      */
-    public function deleteByQuery($query)
+    public function deleteByQuery($query, array $options = array())
     {
         if (is_string($query)) {
             // query_string queries are not supported for delete by query operations
-            return $this->request('_query', Request::DELETE, array(), array('q' => $query));
+            $options['q'] = $query;
+            return $this->request('_query', Request::DELETE, array(), $options);
         }
         $query = Query::create($query);
 
-        return $this->request('_query', Request::DELETE, array('query' => $query->getQuery()));
+        return $this->request('_query', Request::DELETE, array('query' => $query->getQuery()), $options);
     }
 
     /**