FIX: refcount needs a hack when disposing a media-handler-src
FIX: refcount needs a hack when disposing a media-handler-src

As pipeline has a hidden reference, the counter should be incremented
when the bin is removed from the pipe.

Probably this will need a better solution like a weak reference
or something. By now this one is OK.

lulufei/kurento-media-server,shelsonjava/kurento-media-server,mparis/kurento-media-server,lulufei/kurento-media-server,todotobe1/kurento-media-server,mparis/kurento-media-server,Kurento/kurento-media-server,TribeMedia/kurento-media-server,shelsonjava/kurento-media-server,todotobe1/kurento-media-server,TribeMedia/kurento-media-server,Kurento/kurento-media-server