Use one-liners in specs where possible

spec/features/home_spec.rb

@@ -3,9 +3,7 @@ require 'spec_helper'
 feature 'Home page' do
   include UserIntegrationHelpers
 
-  background do
-    sign_in
-  end
+  background { sign_in }
 
   scenario 'displays playlists' do
     playlist = FactoryGirl.create(:playlist, name: 'Electro')

spec/features/playlists_spec.rb

@@ -3,9 +3,7 @@ require 'spec_helper'
 feature 'Playlists' do
   include UserIntegrationHelpers
 
-  background do
-    sign_in
-  end
+  background { sign_in }
 
   scenario 'lists playlists' do
     FactoryGirl.create(:playlist, name: 'Electro')

spec/features/tracks_spec.rb

@@ -3,9 +3,7 @@ require 'spec_helper'
 feature 'Tracks' do
   include UserIntegrationHelpers
 
-  background do
-    sign_in
-  end
+  background { sign_in }
 
   scenario 'shows track' do
     track = FactoryGirl.create(:track, name: 'Mega song')