message: Fix the spinner to actually appear
  We started with clientSyncState being null, which it remained
  until the SYNCING event was emitted. We need to set
  clientSyncState's initial value correctly.
diff: @@ -170,7 +170,7 @@ var TimelinePanel = React.createClass({
  forwardPaginating: false,
  // cache of matrixClient.getSyncState() (but from the 'sync' event)
  - clientSyncState: null,
  + clientSyncState: MatrixClientPeg.get().getSyncState(),
  };
  },
  