Kill trailing whitespace in ruby files

test/unit/advertisement_test.rb

@@ -6,11 +6,11 @@ class AdvertisementTest < ActiveSupport::TestCase
       Danbooru.config.stubs(:advertisement_path).returns("/tmp")
       @ad = FactoryGirl.create(:advertisement, :file => upload_jpeg("#{Rails.root}/test/files/test.jpg"))
     end
-    
+
     teardown do
       FileUtils.rm_f(Dir.glob("#{Rails.root}/public/images/advertisements/*.jpg"))
     end
-    
+
     should "create new hit records" do
       assert_difference("AdvertisementHit.count") do
         @ad.hit!("0.0.0.0")
@@ -20,7 +20,7 @@ class AdvertisementTest < ActiveSupport::TestCase
       assert_equal(1, @ad.hit_sum(1.day.ago, 1.day.from_now))
       assert_equal(0, @ad.hit_sum(2.days.ago, 1.day.ago))
     end
-    
+
     should "know its preview height and preview width" do
       assert_equal(100, @ad.preview_width)
       assert_equal(67, @ad.preview_height)