Add tasks for subscription and unsubscription
Add celery to deps
Fix the delay for subscription and unsubscription retry
Add param CELERY_ALWAYS_EAGER on test running
Revert "Add param CELERY_ALWAYS_EAGER on test running"

This reverts commit b9f5b9ac9f5dae6368d8b64060f237141c9681fa.
Add param CELERY_ALWAYS_EAGER into tasks file
Fix calls to tasks into tests
Celery tasks work in tests
Merge branch 'master' into tasks
Use apply_async into tests instead of delay
Merge pull request #1 from ulule/tasks

Add tasks for subscription and unsubscription