* DQN Atari based on RLLab

* DQN Atari based on RLLab

* DQN Atari based on RLLab

* refactor code without RLLab framework

* add module of saving and loading policy model

* refactor code structure, add DoubleDQN and DuelingDQN modules

* add fluid argmax, flatten utils

* update README.md

* udpdate replay memory

* udpdate replay memory

* update readme, code clean

* clean code and fix codestyle

* fix codestyle

* update README.md

* revisions|history->context, randint->random

* revisions| add comment for max-pooling operation in atari