don't retry ImportWorkers
add host secret for Maintenance Switcher
little fix regarding database configuration
add close_connections_to method for renaming and dropping
use db method instead of DB constant in protected_area.rb
remove pointless begin block
remove with_context from ImportWorkers
move creation of import into S3PollingWorker
move WdpaImportWorker into ImportWorkers module
add finished import to done imports sorted set
don't go back to original connection once done
add sources migration id to pre_seeded_database.sql
add_to_done_imports renamed in import.rb
Merge pull request #86 from unepwcmc/finalise-automatic-import

Finalise automatic import
rename WdpaImportWorker into ImportWorkers::MainWorker
rename MaintenanceSwitcher in WebHandler and add clear_cache
add clear_cache route to admin controller
add new FinaliserWorker for extra work at end of import
add clearing of Rails cache in FinaliserWorker
remove maintenance switcher from import.rb