Added paper_trail, also starting work on the scheduler

db/migrate/20130107112833_add_registration_dates_to_conferences_table.rb

@@ -0,0 +1,6 @@
+class AddRegistrationDatesToConferencesTable < ActiveRecord::Migration
+  def change
+    add_column :conferences, :registration_start_date, :date
+    add_column :conferences, :registration_end_date, :date
+  end
+end

db/migrate/20130107113653_remove_cfp_and_reg_booleans_from_conferences.rb

@@ -0,0 +1,11 @@
+class RemoveCfpAndRegBooleansFromConferences < ActiveRecord::Migration
+  def up
+    remove_column :conferences, :cfp_open
+    remove_column :conferences, :registration_open
+  end
+
+  def down
+    add_column :conferences, :cfp_open, :default => false
+    add_column :registration_open, :default => false
+  end
+end

db/migrate/20130107114930_create_versions.rb

@@ -0,0 +1,19 @@
+class CreateVersions < ActiveRecord::Migration
+  def self.up
+    create_table :versions do |t|
+      t.string   :item_type, :null => false
+      t.integer  :item_id,   :null => false
+      t.string   :event,     :null => false
+      t.string   :whodunnit
+      t.text     :object
+      t.text     :object_changes
+      t.datetime :created_at
+    end
+    add_index :versions, [:item_type, :item_id]
+  end
+
+  def self.down
+    remove_index :versions, [:item_type, :item_id]
+    drop_table :versions
+  end
+end