Merge branch 'add-migration' into 'master'

Add migration to rename column light_logo -> header_logo

Also removes dark_logo which was unused

See merge request !233

db/migrate/20160302141317_rename_header_field_on_appearrance.rb

+class RenameHeaderFieldOnAppearrance < ActiveRecord::Migration
+  def change
+    rename_column :appearances, :light_logo, :header_logo
+
+    remove_column :appearances, :dark_logo
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160222153918) do
+ActiveRecord::Schema.define(version: 20160302141317) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -27,10 +27,11 @@ ActiveRecord::Schema.define(version: 20160222153918) do
   create_table "appearances", force: :cascade do |t|
     t.string   "title"
     t.text     "description"
-    t.string   "header_logo"
     t.string   "logo"
-    t.datetime "created_at",  null: false
-    t.datetime "updated_at",  null: false
+    t.integer  "updated_by"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+    t.string   "header_logo"
   end
 
   create_table "application_settings", force: :cascade do |t|