Move support plugins to their own folder.

lib/roles/device/plugins/heartbeat.js

@@ -4,7 +4,7 @@ var wire = require('../../../wire')
 var wireutil = require('../../../wire/util')
 
 module.exports = syrup()
-  .dependency(require('./push'))
+  .dependency(require('../support/push'))
   .define(function(options, push) {
     function heartbeat() {
       push.send([