Prop 221: Use CREATE_FAST less, or not at all
Supposing something goes wrong with TLS, we'll wish we had never implemented CREATE_FAST.
Supposing that we're talking to a node with ntor support but without ECDHE support in TLS, we'll wish we weren't using CREATE_FAST.
I propose that in 0.2.5, we should stop using CREATE_FAST with nodes that support the ntor handshake.