Billiard

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- Fixed ImportError in billiard._ext

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- 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.

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- 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.

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- 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.

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- Pool: Child processes must ignore SIGINT.

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- Pool: 2.7.3.24 broke support for subprocesses (Issue 48).

Signals that should be ignored were instead handled
by terminating.