Add convenience flags for knowing if a device is usable, ready, and owned by us.

lib/util/datautil.js

@@ -50,6 +50,11 @@ module.exports.applyData = function(device) {
   return device
 }
 
+module.exports.applyOwner = function(device, user) {
+  device.isOwnedByUser = !!device.owner && device.owner.email === user.email
+  return device
+}
+
 module.exports.middleware = function() {
   return express.static(pathutil.root('node_modules/stf-devices-db/data/small'))
 }