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

lib/db/api.js

@@ -58,6 +58,7 @@ dbapi.saveDevice = function(serial, device) {
     , provider: device.provider
     , owner: null
     , status: device.status
+    , ready: false
     , statusChangedAt: r.now()
     , createdAt: r.now()
     , lastHeartbeatAt: r.now()
@@ -89,6 +90,7 @@ dbapi.unsetDeviceOwner = function(serial, owner) {
 dbapi.setDeviceAbsent = function(serial) {
   return db.run(r.table('devices').get(serial).update({
     present: false
+  , ready: false
   , lastHeartbeatAt: null
   }))
 }
@@ -101,7 +103,8 @@ dbapi.setDeviceChannel = function(serial, channel) {
 
 dbapi.saveDeviceIdentity = function(serial, identity) {
   return db.run(r.table('devices').get(serial).update({
-    platform: identity.platform
+    ready: true
+  , platform: identity.platform
   , manufacturer: identity.manufacturer
   , operator: identity.operator
   , model: identity.model