Update reloader.rb

Database was deprecated in version 0.25.0, but was still used in Apartment::Reloader and is causing many deprecation warnings in the log file.
Update migrator.rb

Database.process still called from Apartment::Migrator - should now be Tenant.process.
Merge pull request #157 from bitencode/development

Update reloader.rb - Looks like a use of Appartment::Database was missed.