Support uninstalling applications.

lib/roles/app.js

@@ -434,6 +434,16 @@ module.exports = function(options) {
             )
           ])
         })
+        .on('device.uninstall', function(channel, responseChannel, data) {
+          joinChannel(responseChannel)
+          push.send([
+            channel
+          , wireutil.transaction(
+              responseChannel
+            , new wire.UninstallMessage(data)
+            )
+          ])
+        })
     })
     .finally(function() {
       // Clean up all listeners and subscriptions