title: Django-cities exits with "killed"
body: <p>I am trying to install django-cities on a server with 500mb RAM. Whenever I run:
      manage.py cities</p>
  
  <p>the system exits just saying killed.</p>
  
  <p>Trying to run:
      manage.py cities --import=country --force
  worked, so I am guessing it is a matter of running out of memory.</p>
  
  <p>To bypass, I tried to refer the package to a local copy of the cities' data file. It still didn't work.</p>
  
  <p>Any ideas on how I can migrate the data without having to increase the memory on the server?</p>