Add GCM token field to device

spec/factories/devices.rb

@@ -1,7 +1,7 @@
 FactoryGirl.define do
   factory :device do
-    model "Nexus 6"
-    unique_id "someuniqueid"
-    imei_number "someimeinumber"
+    model "LGE - Nexus 5"
+    unique_id "aa55589dd10a8819"
+    gcm_token "dAJukxHtV84iij0z5PJruUhcNnQSOl7NdeAWS9Y45UVhPoG1wRGp7i2Hp34SyrodDfdZieeDzbPusqYyFuEB_vAUl5EDyYqFdzMNF1JpN2ThkEl_dTawWP9F9rSsNadV1HZ"
   end
 end

spec/models/device_spec.rb

@@ -5,6 +5,7 @@ RSpec.describe Device, type: :model do
 
   it { should validate_presence_of :unique_id }
   it { should validate_presence_of :model }
+  it { should validate_presence_of :gcm_token }
   it { should validate_uniqueness_of :unique_id }
 
   describe "before create" do