Add (index|type)ize methods to String.

TODO: need specs.
Importer "model_class" class method.
Move TradeEvent to ItaTradeEvent.

[#77714604]
TradeEvent module: better org. of related classes.
Developer sees SBA Events feed.

[#77508648]
Reorganize TradeEvents::Ita specs.
Ability to index all Trade Event sources.
Consolidated Trade Events API spec.
Able to filter cons. Trade Events by sources.
TEMPORARILY disable TTL for staging.
Initial commit to support for exim trade events.
Merge branch 'trade-events-consolidated' of github.com:GovWizely/webservices into trade-events-consolidated

Conflicts:
	Gemfile.lock
	app/importers/bisn_foreign_sanctions_evader_data.rb
	app/importers/ofac_special_designated_national_data.rb
	config/routes.rb
	lib/consolidated_screening_list_mappable.rb
	lib/sdn_importer.rb