Further helps with issue #81.

Also, adds -Wl,-rpath arg to bind the final .so to a particular
location.  [This is almost always needed when using a non-OEM ssl lib].

This fixes issue #81.

The test_reenter.py test starts and stops the event loop several
times. The queue_poller is a singleton only created once and, on
the Mac (and probably on FreeBSD) the self.event_map needs to be
reinitialized. While not seen on Linux the same fix is made for
consistency.

Remove legacy system definitions and use Cython builtins instead

The system definitions included in the pyrex directory have been
migrated into Cython directly. The pyrex directory has been removed
and remaining files moved into coro.

Fixes Issue #73.

It's not uncommon for this to hang forever.  I love openssl.

optional tls_ctx arg.

This is the only action that makes sense, AFAIK there are no users of
this code that are not already working around this issue.

Issue #71.

- Switch from distribute to setuptools
- Tweak compilation on MacOSX to use homebrew openssl
- Use MANIFEST.in to include files needed to build

frob: wrap hex-encoded binary data with '<>'.

Issue #70.

# Please enter a commit message to explain why this merge is necessary,
This merge is necessary because I forgot to pull, AGAIN.

url: to shrapnel.
version: raised from 0.5 to 0.8.

This code has been copied with permission from:
    https://github.com/samrushing/amqp-shrapnel
It also has been changed to pass pep8 and to work in the
coro package.