readme: Freeze elasticsearch and postgresql versions
Merge branch 'master' into feature/download-relics

Conflicts:
	app/models/relic.rb
	lib/tasks/relics.rake
fix: Include full descendants objects in the relic:export task
fix: Forward `params` hash instead of hard coded value
Remove relic#to_builder method. Move everything to API
Merge branch 'feature/download-relics' into staging

Conflicts:
	app/models/relic.rb
	lib/tasks/relics.rake