Issue 93: ICE restart behavior still needs to be resolved

Justin Uberti filed Issue 93 (https://github.com/openpeer/ortc/issues/93)

#59<https://github.com/openpeer/ortc/issues/59> attempted to address this, but issues were discovered:
"I don't think this is sufficient given the need for TransportController and freezing policy. The TransportController really needs to be able to redo its thing, suggesting that ICE restart needs to be internal to an IceTransport rather than configured externally. (Unless we want to go down the route of having multiple TCs, which starts getting into questionable territory)."

Robin Raymond asked the following clarifying question:

"Just to clarify, are you saying we need an explicit "restart()" method on the IceTransport? I'm okay with that, just want to clarify."