Add support for git lfs.

spec/factories/lfs_objects.rb

+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :lfs_object do
+    oid "b68143e6463773b1b6c6fd009a76c32aeec041faff32ba2ed42fd7f708a17f80"
+    size 499013
+  end
+
+  trait :with_file do
+    file { fixture_file_upload(Rails.root + "spec/fixtures/dk.png", "`/png") }
+  end
+end

spec/factories/lfs_objects_projects.rb

+# Read about factories at https://github.com/thoughtbot/factory_girl
+
+FactoryGirl.define do
+  factory :lfs_objects_project do
+    lfs_object
+    project
+  end
+end