Add support for .lean() baugarten#164

Author: kefferavelino

lib/model.js

@@ -24,6 +24,7 @@ var methods = ['get', 'post', 'put', 'patch', 'delete'], // All HTTP methods, PA
       'skip': query('skip'),
       'offset': query('offset'),
       'select': query('select'),
+      'lean': query('lean'),
       'sort': query('sort'),
     }, {
       'equals': query('equals'),