Many updates.
Merge branch 'master' of github.com:beltiste/.dotfiles

* 'master' of github.com:beltiste/.dotfiles:
  Added couple new packages to `python/pip/requirements.txt`.
  Fix ssh for vms on econ217.
  Fix drush for www-data user.
  Fix ssh configs, and add `__drush_ps1` and `VIRTUAL_ENV` to `shell/bash/bash_ps1_solarized`.