Update README
- remove sub-organizer example (already in wiki)
- update example for `skip_all!` and `set_failure!`
Merge branch 'update-readme' of github.com:padi/light-service

* 'update-readme' of github.com:padi/light-service:
  Update README - remove sub-organizer example (already in wiki) - update example for `skip_all!` and `set_failure!`