Finished porting over MySQL import functionality.

* removed assertions on #num_inserts, that is db-specific and is handled in details by abstract_adapter_test.

test/schema/generic_schema.rb

@@ -23,7 +23,9 @@ ActiveRecord::Schema.define do
     t.column :parent_id, :integer
     t.column :type, :string
     t.column :created_at, :datetime
+    t.column :created_on, :datetime
     t.column :updated_at, :datetime
+    t.column :updated_on, :datetime
   end
 
   create_table :projects, :force=>true do |t|