Update factory girl to last version

spec/integration/api/api_sign_in_spec.rb

@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 feature 'API sign in' do
-  let(:user)  { Factory.create(:user) }
+  let(:user)  { FactoryGirl.create(:user) }
 
   def do_create
     post api_sessions_path, :format => :json, :session => {

spec/integration/api/cross_origin_request_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 feature 'API cross origin request' do
   include UserIntegrationHelpers
 
-  let(:user)    { Factory.create(:user) }
+  let(:user)    { FactoryGirl.create(:user) }
   let(:origin)  { 'http://origin.example/' }
 
   background do

spec/integration/api/playlists_spec.rb

@@ -8,7 +8,7 @@ feature 'API playlists' do
   end
 
   scenario 'creates playlist' do
-    playlist = Factory.attributes_for :playlist
+    playlist = FactoryGirl.attributes_for :playlist
 
     post api_playlists_path,
       :format => :json,

spec/integration/api/tracks_spec.rb

@@ -8,8 +8,8 @@ feature 'API tracks' do
   end
 
   scenario 'lists tracks' do
-    track_1 = Factory.create(:track_with_sound, :name => 'Track 1')
-    track_2 = Factory.create(:track, :name => 'Track 2')
+    track_1 = FactoryGirl.create(:track_with_sound, :name => 'Track 1')
+    track_2 = FactoryGirl.create(:track, :name => 'Track 2')
 
     get api_tracks_path, :format => :json