Rename table name from identities to integrations
Refactor tests
Refactor models and services
Rename identity_id to integration_id in participations table
Refactor controllers
Refactor views
Finish back-end refactoring
Refactor angular controllers
Rename identities_spec.rb to integrations_spec.rb
Refactor angular views and routes
Finish renaming identities to integrations
Add Integration Subclass type migration
Merge branch 'feature/59081416_rename_identities_to_integrations'

Conflicts:
	app/controllers/api/v1/integrations_controller.rb
	spec/api/identities_api_spec.rb
	spec/api/projects_api_spec.rb
	spec/models/pivotal_tracker_projects_fetcher_spec.rb