Refactor factory girl usage in specs

spec/features/sessions/sign_in_spec.rb

@@ -6,7 +6,7 @@ feature 'User sign in' do
   end
 
   scenario 'signs the user in' do
-    user = FactoryGirl.create(:user)
+    user = create :user
 
     visit new_session_path
     fill_in 'Email', with: user.email

spec/features/sessions/sign_up_spec.rb

@@ -1,5 +1,5 @@
 feature 'User sign up' do
-  let(:user) { FactoryGirl.build(:user) }
+  let(:user) { build :user }
 
   background do
     visit new_user_path