Fix TestHelper caching method for tmpId-Id mappings.
Typo.
Add gudelines about exceptions.
Add a missing parameter name in docs.
Send simulated messages to the Sinatra server.

Before that, simulated messages were given to a callback later in
the processing of an incoming request. This had the drawback of
not correctly writing incoming simulated messages in the logs
nor counting them correctly in stats.
Merge remote-tracking branch 'origin/topic/bf_fix_test_helper' into develop

* origin/topic/bf_fix_test_helper:
  Fix TestHelper caching method for tmpId-Id mappings.
Merge remote-tracking branch 'origin/topic/bf_improve_docs' into develop

* origin/topic/bf_improve_docs:
  Add a missing parameter name in docs.
  Add gudelines about exceptions.
Merge remote-tracking branch 'origin/topic/bf_fix_simulated_messages_logs' into develop

* origin/topic/bf_fix_simulated_messages_logs:
  Send simulated messages to the Sinatra server.
Release version v0.2.3-rc036.