Add a variable install_shadowsocks_with_pypi.
Revert "Add a variable install_shadowsocks_with_pypi."

This reverts commit 28fa0c622701962c6f5cb56020ff7cbce2752805.
Merge branch 'master' of https://github.com/ftao/vpn-deploy-playbook

# By ftao
# Via ftao
* 'master' of https://github.com/ftao/vpn-deploy-playbook:
  install shadowsocks python version or libev version
  update README
Update gitignore.
Fix typo.
Testing for every role with Vagrant.
Fix README.
Fix README again.
Merge pull request #14 from lexrus/master

Testing for every role with Vagrant.