Sloth-ci

- API: trigger: `wait` param added: block until the triggerred actions are completed.
- Bed: Payload json is now parsed before the request is passed to a validator.
- CLI: Help texts improved.
- CLI: trigger: `-wait` flag added: block until the triggerred actions are completed.
- Setup: Built-in extensions were not properly installed. Fixed.

- API CLI vocabulary changed.
- API reimplemented as a built-in extension.
- A single extension can now extend apps, server, and CLI with `extend_sloth`, `extend_bed`, and `extend_cli` functions.
- CLI: Cliar is now used instead of docopt.
- Tons of small changes.

- Bed: Server extensions now can override all Bed methods.

- API: Server: Bind: Config file binding didn't work. Fixed.
- CLI: Info: Info didn't work. Fixed.

- Code cleanup.
- Bed: Server extension support added.

- CLI: history output is now colorized.
- CLI: Level column hidden from history and info output.