Create device model and setup devise, activeadmin and rspec!

- with attributes: model, imei_number, unique_id and access_token
 - access_token is automatically generated on create

spec/factories/admin_users.rb

@@ -0,0 +1,6 @@
+FactoryGirl.define do
+  factory :admin_user do
+    
+  end
+
+end

spec/factories/devices.rb

@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :device do
+    model "Nexus 6"
+    unique_id "someuniqueid"
+    imei_number "someimeinumber"
+  end
+end