Delete a bunch of old images

These are only images that I was >99% sure we did not need. There
are probably still some random graphics lingering around, but I
think I got the bulk of the obviously-orphaned ones.
Switch providers#edit with providers#show
Switch providers#edit with providers#show - fix tests
Delete provider toggle
Delete provider toggle - fix tests
Merge pull request #358 from n1zyy/old_images

Delete a bunch of old images
Merge pull request #366 from ifarkas/providers_refactor

Providers page refactor: switch providers#edit with providers#show
Merge pull request #368 from martinpovolny/fix-error-handler

fix typo in error handling in deployables
FK: add foreigner to Gemfile
add foreign keys for catalog_entries
add foreign keys for catalogs
add foreign keys to deployables
add foreign keys for deployments
add foreign keys for hardware_profiles
fix provider controller tests to prevent referencial integrity breaking
add foreign keys for pools
add foreign keys for pool_families
add foreign keys for pool_families_provider_accounts
fixing habtm between provider_accounts and pool families
and fixing an api test