Reap dead devices using timeouts. Previously, if a provider died without being able to clean up properly, the device would stay as a ghost.

lib/wire/util.js

@@ -5,6 +5,7 @@ var wire = require('./')
 var wireutil = {
   global: '*ALL'
 , log: '*LOG'
+, heartbeat: '*HB'
 , makePrivateChannel: function() {
     return uuid.v4(null, new Buffer(16)).toString('base64')
   }