* Refactor setup_bridge_features_builtin().

* Add an error message so you know when a feature is not available and you
tried to use it.  It usually means the module has not been loaded.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@395316 65c4cc65-6c06-0410-ace0-fbb531ad65f3