* add support of RegExp input of distributed_files[]

* add support of RegExp input of distributed_files[]

* add the function to get and set attributes of remote models

* get_set_attributes, not finished

* get_set_atributes, not finieshed yet

* add function to get and set attributes of remote model

* add function to get and set attributes of remote models

* add more unnitest cases, together with several comments

* make codes reusable