Implement the RequestAvatar and AvatarRetrieved signals in the service proxy
Implement the RequestAvatar and AvatarRetrieved signals in the service proxy

When we manufacture the service instance we connect to the signal and the emit
the signal on the proxy that automatically gets bridged onto the bus.

GNOME/libsocialweb,lcp/libsocialweb,lcp/mojito,ThomasBollmeier/libsocialweb-flickr-oauth,GNOME/libsocialweb,GNOME/libsocialweb,lcp/libsocialweb,ThomasBollmeier/libsocialweb-flickr-oauth,lcp/mojito,lcp/mojito,lcp/libsocialweb,ThomasBollmeier/libsocialweb-flickr-oauth