- Added Python 3 Trove classifiers.

because porting zope.publisher is not done, but with buildout I am able
to run against the branch. Same for ZODB.

IContainer interface does not need to be re-implemented. Added a ``data``
attribute for BBB.

zope.container code just needs the IBroken interface from ZODB, plus some tests
use DemoStorage and transactions.  Moved the tests into a separate suite that
is included conditionally, hedged out the IBroken interface.

Now the only two dependencies that don't support Py3 are zope.publisher and
zope.traversing.

This was needed since a change introduced in zope.proxy in 2006,
but the local copy of _zope_proxy_proxy.c was even more ancient.

Hashes of the files' commits in the persistent repo are as follows:

  - cPersistence.h: 8699c7fc
  - ring.h:         5364296a
  - _compat.h:      3769ede0

This one comes from zope.proxy commit 2938c335, version 4.1.2dev.

More information in the enclosed README.txt file.

(LP#1070719).

Replace deprecated 'zope.component.adapts' usage with equivalent
'zope.component.adapter' decorator.

Replace deprecated 'zope.interface.implements' usage with equivalent
'zope.interface.implementer' decorator.

I tried to adjust the doctest to ensure the traceback is not lost, but
as soon as I start it with a '...' (because I don't care about oldest frames),
the doctest comparator ignores everything about the traceback.

Fixes https://bugs.launchpad.net/zope.container/+bug/705600.