[cally] Removing default name and description

[cally] Removing default name and description

Those were added on the old "just for automatic testing" times. That was
somewhat silly on that moment. Now is just silly (ie: having the stage
returning as default name "Stage").

The real description should be set by the app, or provided by the
context of a specific actor feature (like the tooltip on StWidget).

The current information provided by the default description can be
mostly obtained from the ATK_ROLE, and the indirect debugging
advantage of having always a meaningful description is just not enough
to justify them, and you can solve that by proper debug logging.

Fixes: http://bugzilla.clutter-project.org/show_bug.cgi?id=2482