Zope.intid

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- Add support for testing on Travis.

====================

- Add support for Python 3.3.

- Replace deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Drop support for Python 2.4 and 2.5.

- Bug fix: ensure that the IntId utility never generates ids greater
than the maxint of the BTree family being used.

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- Use the zope.component API in favor of ztapi.

- Remove ``zope.app.testing`` dependency.

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- Remove dependencies on ``zope.container``. Instead import
``Object*Event`` classes from ``zope.lifecycleevent`` and import
``IContained`` from ``zope.location``. In order to be able to do
this, depend on ``zope.lifecycleevent``>=3.5.2 and
``zope.location``>=3.5.4.

- Remove a dependency on ``zope.container.contained.Contained``
(this is a dumb base class that defines __parent__ and __name__
as None and declares that the class implements IContained).

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- Split out this package from ``zope.app.intid``. The latter one
now only contains browser views and compatibility imports while
whole IntId functionality is moved here.