title: BjyAuthorize with ZfcUser and Doctrine - managing user_role_linker
body: <p>I have implemented BjyAuthorize with ZfcUser and Doctrine and can successfully set up the roles and linked them to <code>user_id</code> in the <code>user_role_linker</code> table.  Next I want to add a simple admin panel to get, add and remove users from the <code>user_role_linker</code> table.</p>
  
  <p>I can see certain methods available based on the currently logged in identity e.g. <code>getIdentityRoles()</code> but how is it possible to get /add / remove roles for any user?</p>
  
  <p>This is clearly possible with MySQL direct to the table but presumably it's achievable by a BjyAuthorize service?</p>