Petisco

* Fix bug on task configuration. It's been using `instant` instead of `recurring`.

* Use `uuid.uuid4()` as `EventId` generator
* Now `RequestResponded` do not includes http content for 2XX status codes.

* Refactor RabbitMQEventSubscriber to avoid problem when an application instanciate more than one object
- Use `start` instead `subscribe_all`
- Use `stop` instead `unsubscribe_all`

* Fixed bug in scheduled tasks
* Fixed bugs and add integration tests for `subscriber_handler`

* Update when the log is printed when petisco application starts

* Refactor cron instances. Now we will use tasks definition 68
- Add different task types: `recurring`, `scheduled`, `instant`.

yml
tasks:
recurring-task:
run_in: 5 seconds
interval: 10 seconds
handler: taskmanager.tasks.recurring_task
scheduled-task:
run_in: 10 seconds
handler: taskmanager.tasks.scheduled_task
instant-task:
handler: taskmanager.tasks.instant_task