Zope.testbrowser

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- LP 568806: Update dependency ``mechanize >= 0.2.0``, which now includes
the ``ClientForm`` APIs. Remove use of ``urllib2`` APIs (incompatible
with ``mechanize 0.2.0``) in favor of ``mechanize`` equivalents.
Thanks to John J. Lee for the patch.

- Use stdlib ``doctest`` module, instead of ``zope.testing.doctest``.

- **Caution:** This version is no longer fully compatible with Python 2.4:
``handleErrors = False`` no longer works.

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- Pin dependency on ``mechanize`` to prevent use of the upcoming
0.2.0 release before we have time to adjust to its API changes.

- Fix LP 98396: testbrowser resolves relative URLs incorrectly.

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- Add ``follow`` convenience method which gets and follows a link.

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- Move ``zope.app.testing`` dependency into the scope of the
``PublisherConnection`` class. Zope2 specifies its own version of
``PublisherConnection`` which isn't dependent on ``zope.app.testing``.

- Fix LP 419119: return ``None`` when the browser has no contents instead
of raising an exception.

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

- Update dependency from ``zope.app.publisher`` to
``zope.browserpage``, ``zope.browserresource`` and ``zope.ptresource``.

- Remove dependencies on ``zope.app.principalannotation`` and
``zope.securitypolicy`` by using the simple ``PermissiveSecurityPolicy``.

- Replace the testing dependency on ``zope.app.zcmlfiles`` with explicit
dependencies of a minimal set of packages.

- Remove unneeded ``zope.app.authentication`` from ftesting.zcml.

- Update dependency from ``zope.app.securitypolicy`` to
``zope.securitypolicy``.

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

- Update dependency from ``zope.app.folder`` to ``zope.site.folder``.

- Remove unnecessary test dependency in ``zope.app.component``.