Nicolas Jager authored Sep 28, 2017 and Sébastien Blin committed Oct 12, 2017

- this class is an helper for clients. Clients can connect
signals from this class to easily update their views.

- for now, this class has the following signals:
  - showChatView: the client should open the chat view.
  - showCallView: the client should open the call view.
  - showIncomingCallView: the client should open the incoming call
    view.

Change-Id: I9f51859c08aeadacf46d3c828dc9ab012c19b8f1
Reviewed-by: Guillaume Roguez <guilaume.roguez@savoirfairelinux.com>