make item.audio_files.transcript more like the transcript object, include speakers
change transcript json to not format time values
make current player work by setting using the transcript.parts instead of transcript
Merge branch 'add_speakers' into speaker_update

Conflicts:
	app/assets/html/items/show.html.slim
Install elasticsearch-model and elasticsearch-rails
Add elasticsearch rake tasks
Update application config with elasticsearch instrumentation
Add sidekiq indexer worker
Add model concern searchable
Update models to use searchable concern instead of tire
Update application config to autoload model concerns
Update concern searchable to check if there are deleted_at field
Fix query_builder match_all naming issues
Make sidekiq to use config
Rename indexer worker to indexer_worker
Update searchable callbacks
Remove obsolete methods from models
Install elasticsearch-extenstions to power test suits
Update spec_helper with elasticsearch configuration
Add indexer_worker spec