pull/push over tor working now

Still a couple bugs:

* Closing the connection to the server leaves git upload-pack /
  receive-pack running, which could be used to DOS.

* Sometimes the data is transferred, but it fails at the end, sometimes
  with:

  git-remote-tor-annex: <socket: 10>: commitBuffer: resource vanished (Broken pipe)

  Must be a race condition around shutdown.

Utility/Tor.hs

@@ -17,8 +17,12 @@ import qualified Data.ByteString.UTF8 as BU8
 import qualified System.Random as R
 
 type OnionPort = Int
+
 newtype OnionAddress = OnionAddress String
+	deriving (Show)
+
 type OnionSocket = FilePath
+
 type UniqueIdent = String
 
 connectHiddenService :: OnionAddress -> OnionPort -> IO Socket