Recent code updates

[HanGuo97]

0.4

Major Changes

• Two Dockerfile and cluster/docker.update.sh for building in two environments
• Added cluster/kube.experiments.yaml for non-interactive experiments running.
• experiments/mnli.py: support running experiments on examples that with correct and incorrect predictions.
• experiments/: Added remote_utils.py for synchronizing files with a remote server.
• Removed deprecated language_modeling.py
• Added run_experiments.py and scripts/run_experiments.sh for non-interactive experiments running.
• Copied the GLUE data download script and paste them into scripts/down_glue_data.py.

Minor Changes

• Added the missing .gitignore.
• Merged cluster/docker.run.{gpu|cpu}.sh into a single file used in custom environment
• Updated cluster/docker.update.sh to include recent file changes.
• experiments/constants.py: added more constants used in experiments.remote_utils.py
• experiments/misc_utils.py: added a few more useful tools.
• Updated requirements.txt with libraries used in experiments/remote_utils.py

[salesforce-cla[bot]]

Thanks for the contribution! Before we can merge this, we need @HanGuo97 to sign the Salesforce.com Contributor License Agreement.