Removed item from TODO

darcs-hash:20090609174835-58103-903c13440e7152c7adac80117d6bfc124a082431
Added ice_active an corresponding notification to RTPTransport

- The RTPTransportCompletedICENegotiation notification indicates ICE
  negotation is completed.
- This patch also improves internal handling of RTPTransport callbacks

darcs-hash:20090610161833-58103-010cfb09ccdc5c83628609c4ccf01b1d7a100116