qi.future: Implements conversion from `Future<T>` to `Future<AnyValue>` in a more explicit manner.
qi.future: Implements conversion from `Future<T>` to `Future<AnyValue>` in a more explicit manner.

May fix the build of dependent projects.

Change-Id: Ic8017a69a95c7ff843824629f83aa6067867b328
Reviewed-on: http://gerrit2.aldebaran.lan/1268
Reviewed-by: gerrit <3b97070d46ccd66422a8e7b83e6967ed84780538@aldebaran-robotics.com>
Reviewed-by: jmonnon <8898eaf233516e520f996a244ca8a12d20f948b1@aldebaran.com>
Reviewed-by: vincent.palancher <f8ff75e1c61314c499fafa8de0d9e004e87e66b0@softbankrobotics.com>
Tested-by: vincent.palancher <f8ff75e1c61314c499fafa8de0d9e004e87e66b0@softbankrobotics.com>

aldebaran/libqi,aldebaran/libqi,aldebaran/libqi