remove trailing spaces and blank lines

db/migrate/20121223135240_create_roles_table.rb

@@ -5,7 +5,7 @@ class CreateRolesTable < ActiveRecord::Migration
       t.timestamps
     end
   end
- 
+
   def self.down
     drop_table :roles
   end

db/migrate/20121223135447_user_roles_table.rb

@@ -4,7 +4,7 @@ class UserRolesTable < ActiveRecord::Migration
       t.references :role, :user
     end
   end
-     
+
   def self.down
     drop_table :roles_users
   end

db/migrate/20130104142209_create_comments.rb

@@ -1,7 +1,7 @@
 class CreateComments < ActiveRecord::Migration
   def self.up
     create_table :comments do |t|
-      t.string :title, limit: 50, default: "" 
+      t.string :title, limit: 50, default: ""
       t.text :comment
       t.references :commentable, polymorphic: true
       t.references :user

db/migrate/20130104142839_acts_as_commentable_upgrade_migration.rb

@@ -5,15 +5,13 @@ class ActsAsCommentableUpgradeMigration < ActiveRecord::Migration
     add_column :comments, :parent_id, :integer
     add_column :comments, :lft, :integer
     add_column :comments, :rgt, :integer
-    
   end
-  
+
   def self.down
     rename_column :comments, :body, :comment
     remove_column :comments, :subject
     remove_column :comments, :parent_id
     remove_column :comments, :lft
     remove_column :comments, :rgt
-    
   end
 end

db/migrate/20140212175251_add_use_difficulty_levels_to_conference.rb

@@ -1,5 +1,5 @@
 class AddUseDifficultyLevelsToConference < ActiveRecord::Migration
   def change
-    add_column :conferences, :use_difficulty_levels, :boolean, default: false    
+    add_column :conferences, :use_difficulty_levels, :boolean, default: false
   end
 end

db/migrate/20140305102505_use_vdays_vpositions_defaults.rb

@@ -5,7 +5,7 @@ class UseVdaysVpositionsDefaults < ActiveRecord::Migration
   end
 
   def down
-    change_column :conferences, :use_vpositions, :boolean, default: nil 
-    change_column :conferences, :use_vdays, :boolean, default: nil 
+    change_column :conferences, :use_vpositions, :boolean, default: nil
+    change_column :conferences, :use_vdays, :boolean, default: nil
   end
 end