added the new key waiter to be cleaned up on error in wormhole

Also, set new print statment to print to args.stdout

src/wormhole/cli/cmd_send.py

@@ -86,7 +86,8 @@ class Sender:
         print(u"", file=args.stdout)
 
         key_established = yield w.establish_key()
-        print(u"Key established, waiting for confirmation...")
+        print(u"Key established, waiting for confirmation...",
+              file=args.stdout)
 
         # TODO: don't stall on w.verify() unless they want it
         verifier_bytes = yield w.verify() # this may raise WrongPasswordError

src/wormhole/wormhole.py

@@ -289,7 +289,7 @@ class _Wormhole:
         returns a Deferred that fires when we've established the shared key.
         When successful, the Deferred fires with a simple `True`, otherwise
         it fails.
-        
+
         """
         return self._API_establish_key()
 
@@ -852,6 +852,9 @@ class _Wormhole:
         if self._verifier_waiter and not self._verifier_waiter.called:
             if self.DEBUG: print("EB VW")
             self._verifier_waiter.errback(error)
+        if self._key_waiter and not self._key_waiter.called:
+            if self.DEBUG: print("EB KW")
+            self._key_waiter.errback(error)
         for d in self._receive_waiters.values():
             if self.DEBUG: print("EB RW")
             d.errback(error)