added methods to MongoDriver for custom commands, findAndModify, count

model/MongoModel.php

@@ -13,6 +13,11 @@
 abstract class MongoModel extends Model
 {
 
+    public function count($query = array(), $limit = 0, $skip = 0)
+    {
+        return $this->db->count($this->table(), $query, $limit, $skip);
+    }
+
     public function find($condition = array())
     {
         return $this->db->find($this->table(), $condition);