Celery

- **Removed support for PHP 5.3.**
- celery-php now uses a PSR-4 compliant namespace, `Celery`. To migrate to the
new version, change code from `new Celery(…)` to `new \Celery\Celery(…)`.
- Now supports php-amqplib/php-amqplib for the amqplib backend as
videlalvaro/php-amqplib is abandoned.
- Fix crash with the ampqlib backend when Celery has not yet created the
results exchange.
- The `Celery` constructor no longer accepts the argument
`persistent_messages`. It was previously unused.
- celery-php now uses Celery task protocol version 2 and requires Celery 4.0+.


Changes
=======

.. _version-5.1.0:

---------------------

- Fixed ImportError in billiard._ext

---------------------

- Compilation: Fixed improper handling of HAVE_SEM_OPEN (Issue 55)

Fix contributed by Krzysztof Jagiello.

- Process now releases logging locks after fork.

This previously happened in Pool, but it was done too late
as processes logs when they bootstrap.

- Pool.terminate_job now ignores `No such process` errors.

- billiard.Pool entrypoint did not support new arguments
to billiard.pool.Pool

- Connection inbound buffer size increased from 1kb to 128kb.

- C extension cleaned up by properly adding a namespace to symbols.

- _exit_function now works even if thread wakes up after gc collect.

---------------------

- Pool: Fixed regression that disabled the deadlock
fix in 2.7.3.24

- Pool: RestartFreqExceeded could be raised prematurely.

- Process: Include pid in startup and process INFO logs.

---------------------

- Manager now works again.

- Python 3 fixes for billiard.connection.

- Fixed invalid argument bug when running on Python 3.3

Fix contributed by Nathan Wan.

- Ignore OSError when setting up signal handlers.

---------------------

- Pool: Child processes must ignore SIGINT.