message: Use `getStateKey` instead of `getSender`
  This makes sure that the kickee is not the user used for the MemberEventListSummary
diff: @@ -181,7 +181,7 @@ module.exports = React.createClass({
  };
  eventsToRender.forEach((e) => {
  - const userId = e.getSender();
  + const userId = e.getStateKey();
  // Initialise a user's events
  if (!userEvents[userId]) {
  userEvents[userId] = {first: null, last: null};
  