Leave transaction channel when it's done. Could be made cleaner if more code was moved to the app side.

lib/roles/app.js

@@ -258,7 +258,6 @@ module.exports = function(options) {
         socket.emit('tx.progress', channel.toString(), message)
       })
       .on(wire.TransactionDoneMessage, function(channel, message) {
-        //leaveChannel(channel)
         socket.emit('tx.done', channel.toString(), message)
       })
       .handler()
@@ -323,6 +322,9 @@ module.exports = function(options) {
         ])
       })
       // Transactions
+      .on('tx.cleanup', function(channel) {
+        leaveChannel(channel)
+      })
       .on('shell.command', function(channel, responseChannel, data) {
         joinChannel(responseChannel)
         push.send([