* Added FailedJobRegistry.

* Added job.failure_ttl.

* queue.enqueue() now supports failure_ttl

* Added registry.get_queue().

* FailedJobRegistry.add() now assigns DEFAULT_FAILURE_TTL.

* StartedJobRegistry.cleanup() now moves expired jobs to FailedJobRegistry.

* Failed jobs are now added to FailedJobRegistry.

* Added FailedJobRegistry.requeue()

* Document the new `FailedJobRegistry` and changes in custom exception handler behavior.

* Added worker.disable_default_exception_handler.

* Document --disable-default-exception-handler option.

* Deleted worker.failed_queue.

* Deleted "move_to_failed_queue" exception handler.

* StartedJobRegistry should no longer move jobs to FailedQueue.

* Deleted requeue_job

* Fixed test error.

* Make requeue cli command work with FailedJobRegistry

* Added .pytest_cache to gitignore.

* Custom exception handlers are no longer run in reverse

* Restored requeue_job function

* Removed get_failed_queue

* Deleted FailedQueue

* Updated changelog.

* Document `failure_ttl`

* Updated docs.

* Remove job.status

* Fixed typo in test_registry.py

* Replaced _pipeline() with pipeline()

* FailedJobRegistry no longer fails on redis-py>=3

* Fixes test_clean_registries

* Worker names are now randomized

* Added a note about random worker names in CHANGES.md

* Worker will now stop working when encountering an unhandled exception.

* Worker should reraise SystemExit on cold shutdowns

* Added anchor.js to docs

* Support for Sentry-SDK (#1045)

* Updated RQ to support sentry-sdk

* Document Sentry integration

* Install sentry-sdk before running tests

* Improved rq info CLI command to be more efficient when displaying lar… (#1046)

* Improved rq info CLI command to be more efficient when displaying large number of workers

* Fixed an rq info --by-queue bug

* Fixed worker.total_working_time bug (#1047)

* queue.enqueue() no longer accepts `timeout` argument (#1055)

* Clean worker registry (#1056)

* queue.enqueue() no longer accepts `timeout` argument

* Added clean_worker_registry()

* Show worker hostname and PID on cli (#1058)

* Show worker hostname and PID on cli

* Improve test coverage

* Remove Redis version check when SSL is used

* Bump version to 1.0

* Removed pytest_cache/README.md

* Changed worker logging to use exc_info=True

* Removed unused queue.dequeue()

* Fixed typo in CHANGES.md

* setup_loghandlers() should always call logger.setLevel() if specified

* modify zadd calls for redis-py 3.0

redis-py 3.0 changes the zadd interface that accepts a single
mapping argument that is expected to be a dict.
https://github.com/andymccurdy/redis-py#mset-msetnx-and-zadd

* change FailedQueue.push_job_id to always push a str

redis-py 3.0 does not attempt to cast values to str and is left
to the user.

* remove Redis connection patching

Since in redis-py 3.0, Redis == StrictRedis class, we no longer
need to patch _zadd and other methods.
Ref: https://github.com/rq/rq/pull/1016#issuecomment-441010847

* added logging formatting options

* added docs for log formatting options

* fixed naming format

* add periodic worker heartbeats

fixes #944

* improve worker default option handling

This includes:

- a partial refactor of the CLI to organize the shared options
- extends the tests in areas where passing custom backend classes makes sense
- allow setting the core CLI options as env vars
- minor cosmetic changes here and there