Zope.testbrowser

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

- Move the over-the-wire.txt doctest out of the TestBrowserLayer as it doesn't
need or use it.

- Fix test compatibility with zope.app.testing 3.8.1.

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

- Fixed backwards compatibility with ``zope.app.wsgi.testlayer``.

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

- Fixed Python 2.7 compatibility in Browser.handleErrors.

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

- Fixed a bug that caused the ``Browser`` to keep it's previous ``contents``
The places are:
- Link.click()
- SubmitControl.click()
- ImageControl.click()
- Form.submit()

- Also adjusted exception messages at the above places to match
pre version 3.4.1 messages.

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

- LP 98437: use ``mechanize``'s built-in ``submit()`` to submit forms,
allowing ``mechanize`` to set the "Referer:" (sic) header appropriately.

- Fixed tests to run with ``zope.app.testing`` 3.8 and above.

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

- 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.