GitLab

Remove "RUN python3 -m pip --no-cache-dir install torch torchvision"

1.Set scikit-learn==0.20.0 in Dockerfile
2.Update readme.md of dockerile
3.Add PyTorch 0.4.1
4.Add description for 'nnictl stop all'

* update local demo doc and configuration

* change folder name

* Update tutorial_1_CR_exp_local_api.md

no need to have a new training file

* Delete mnist_gpu.py

no need to have a new training file

* Update config_gpu.yml

no need to have a new training file

* add PyTorch to Dockerfile

* update doc for docker image

* update

* refactor Dockerfile

1.fix some bugs
2.support nnictl stop id, and add some regulars

* Merge latest code changes into Github Master

* temporary modification for travis

* temporary modification for travis