Fix unimplemented FutureBase::state.

Change-Id: I428f8f937004df95f6f7ca761a989c2cbe40130d
Reviewed-on: http://gerrit.aldebaran.lan:8080/16574
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: mnottale <mnottale@aldebaran-robotics.com>
Catch exceptions in future signals.

Change-Id: Ie17146c55d79b5ffb99eea9074a1945d1bfb138f
Reviewed-on: http://gerrit.aldebaran.lan:8080/16578
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: mnottale <mnottale@aldebaran-robotics.com>
default event loops: reset the pointer when deleting.

Change-Id: Iba13bcc16acb3ca226f4b180837f90e060d6a182
Reviewed-on: http://gerrit.aldebaran.lan:8080/15300
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Tested-by: cgestes <gestes@aldebaran-robotics.com>