Unilateral remove from followers (#232)

[akkoma] / test / fixtures / user_full.xml

<author>
  <activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
  <uri>http://gs.example.org:4040/index.php/user/1</uri>
  <name>lambda</name>
  <link rel="avatar" type="image/png" media:width="96" media:height="96" href="http://gs.example.org:4040/theme/neo-gnu/default-avatar-profile.png"/>
  <link rel="avatar" type="image/png" media:width="48" media:height="48" href="http://gs.example.org:4040/theme/neo-gnu/default-avatar-stream.png"/>
  <link rel="avatar" type="image/png" media:width="24" media:height="24" href="http://gs.example.org:4040/theme/neo-gnu/default-avatar-mini.png"/>
  <poco:preferredUsername>Constance Variable</poco:preferredUsername>
  <poco:displayName>lambadalambda</poco:displayName>
</author>