Add room and dates to tracks

They are required only for accepted and confirmed self-organized tracks

db/migrate/20170712120556_add_room_and_dates_to_tracks.rb

@@ -0,0 +1,7 @@
+class AddRoomAndDatesToTracks < ActiveRecord::Migration
+  def change
+    add_reference :tracks, :room, index: true, foreign_key: true
+    add_column :tracks, :start_date, :date
+    add_column :tracks, :end_date, :date
+  end
+end

db/schema.rb

@@ -522,8 +522,12 @@ ActiveRecord::Schema.define(version: 20170807092805) do
     t.string   "state"
     t.boolean  "cfp_active"
     t.integer  "submitter_id"
+    t.integer  "room_id"
+    t.date     "start_date"
+    t.date     "end_date"
   end
 
+  add_index "tracks", ["room_id"], name: "index_tracks_on_room_id"
   add_index "tracks", ["submitter_id"], name: "index_tracks_on_submitter_id"
 
   create_table "users", force: :cascade do |t|