add xmppgit command; roughed out xmpp push protocol and design

Command/XMPPGit.hs

@@ -0,0 +1,24 @@
+{- git-annex command
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.XMPPGit where
+
+import Common.Annex
+import Command
+import Assistant.XMPP.Git
+
+def :: [Command]
+def = [noCommit $ noRepo xmppGitRelay $ dontCheck repoExists $
+	command "xmppgit" paramNothing seek "git to XMPP relay (internal use)"]
+
+seek :: [CommandSeek]
+seek = [withWords start]
+
+start :: [String] -> CommandStart
+start _ = do
+	liftIO xmppGitRelay
+	stop