title: liferay enable organization or community by role
body: <p>I am working on a new liferay implementation.  I have all of my users in an external system, and have used the external env. to authenticate through my own authentication system.  I also store roles in this same system.  I have been able to successfully pass these to liferay so that all of my users roles are available in liferay.  </p>
  
  <p>I would like to create an organization or community that is associated with a role.  For example if I have a role called 'myusers' in my external system, I would like to tie that role to an organization or community in liferay.  Then when a user logged in to liferay with that role, they would be able to be part of that organization or community.  Is this possible in liferay?  I know it's kind of backwards to the normal flow in liferay of adding roles to users and then adding user to a community or organization.</p>