Remove deprecated attributes from Legislation::Process

Some fields from Legislation::Process are translatable and we no longer
need them. This commit will remove the annoying deprecation warning
thrown by Globalize gem after gem version update.

db/migrate/20190221164928_remove_deprecated_translatable_fields_from_legislation_processes.rb

@@ -0,0 +1,8 @@
+class RemoveDeprecatedTranslatableFieldsFromLegislationProcesses < ActiveRecord::Migration[4.2]
+  def change
+    remove_column :legislation_processes, :title, :string
+    remove_column :legislation_processes, :summary, :text
+    remove_column :legislation_processes, :description, :text
+    remove_column :legislation_processes, :additional_info, :text
+  end
+end

db/schema.rb

@@ -788,9 +788,6 @@ ActiveRecord::Schema.define(version: 20190607160900) do
   end
 
   create_table "legislation_processes", force: :cascade do |t|
-    t.string   "title"
-    t.text     "description"
-    t.text     "additional_info"
     t.date     "start_date"
     t.date     "end_date"
     t.date     "debate_start_date"
@@ -802,7 +799,6 @@ ActiveRecord::Schema.define(version: 20190607160900) do
     t.datetime "hidden_at"
     t.datetime "created_at",                                        null: false
     t.datetime "updated_at",                                        null: false
-    t.text     "summary"
     t.boolean  "debate_phase_enabled",              default: false
     t.boolean  "allegations_phase_enabled",         default: false
     t.boolean  "draft_publication_enabled",         default: false