Created by: wangkuiyi

As we decided to use Docker container as our development environement, we need to add some tools into Dockerfile:

• bash/git auto-completion: https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash
• remember git password: http://stackoverflow.com/a/5343146/724872
• git-aware bash prompt: https://github.com/jimeh/git-aware-prompt
• pre-commit and clang-format:

  apt-get install -y clang-format-3.8
  ln -s /usr/bin/clang-format-3.8 /usr/bin/clang-format
  pip install -U pre-commit