Rename "roles" to "units". Put units in their own folders.

lib/units/device/plugins/display.js

@@ -0,0 +1,25 @@
+var syrup = require('syrup')
+
+var logger = require('../../../util/logger')
+
+module.exports = syrup.serial()
+  .dependency(require('./service'))
+  .dependency(require('./http'))
+  .define(function(options, service, http) {
+    var log = logger.createLogger('device:plugins:display')
+
+    function fetch() {
+      log.info('Fetching display info')
+      return service.getDisplay(0)
+        .catch(function() {
+          log.info('Falling back to HTTP API')
+          return http.getDisplay(0)
+        })
+        .then(function(display) {
+          display.url = http.getDisplayUrl(display.id)
+          return display
+        })
+    }
+
+    return fetch()
+  })