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
fix lately added tests that break on the FK constraints
add Gemfile.lock with foreigner
Merge pull request #339 from martinpovolny/fk2

add foreign keys to the database part one