* Substrate service
* Splitting polkadot service
* Specialised components
* Specialised components
* Docs and style
* Docs and style
* Final touches
* Added db key assertion
* arbitrary application logic in CLI
* collation work
* split up exit and work futures in application
* collation node workflow
* typo
* indentation fix
* doc grumbles
* rename Application to Worker
* refactor Worker::exit to exit_only
* CLI options and keystore integration
* Replace multiqueue with future::mpsc
* BFT gossip
* Revert to app_dirs
* generate_from_seed commented
* Refactor event loop
* Start consensus by timer
* Message buffering
* Minor fixes
* Work around duty-roster issue.
* some more minor fixes
* fix compilation
* more consistent formatting
* make bft input stream never conclude
* Minor fixes
* add timestamp module to executive
* more cleanups and logging
* Fixed message propagation
Arkadiy Paronyan