Plone.testing

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- Fix quoting of urls by the testbrowser.
[do3cc]

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- Update manifest.in to include content in src directory.
[esteele]

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- Fixed an issue where a query string would be unquoted twice;
once while setting up the HTTP request and once in the handler (the publisher).
[malthe]

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- Fixed the cache reset code.
In some situations the function does not have any defaults,
so we shouldn't try to clear out the app reference.
[malthe]

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- Fixed class names in documentation to match code.
[icemac]

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- The defaults of the ``ZPublisher.Publish.get_module_info`` function cache
a reference to the app, so make sure that gets reset when tearing down the
app. This fixes a problem where the testbrowser in the second functional
layer to be set up accessed the database from the first functional layer.
[davisagli]