Ftw-testing

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

- Drop official Plone 4.0 support.
[jone]

- Component registry layer: use isolated ZCML layers.
When using the same layer instances it may conflict with integration or
functional testing layers.
[jone]

- Add splinter integration and Plone page objects.
[jone]

- onegov.ch approved: add badge to readme.
[jone]

- MockTestCase: Support Products.PloneHotfix20121106 patch when mocking getToolByName.
[jone]

- MockTestCase: add checks that setUp is called correctly.
[jone]

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

- Add ``stub_reponse`` method to ``MockTestCase`` and adjust the
``stub_request`` method accordant.
[phgross]

- Made providing interfaces configurable for the ``stub_request`` method.
[phgross]

- Let the stub_request method also stub the getStatus of the response.
[phgross]

- Add ``stub_request`` method to ``MockTestCase``.
[jone]

- No longer tear down the component registry in mock test case. Use the
ComponentRegistryLayer.
[jone]

- Add ``ComponentRegistryLayer`` base class.
[jone]

- Add ``mock_interface`` and ``stub_interface`` methods to MockTestCase, creating
a mock and using the interface as spec.
[jone]

- Accept also interfaces directly rather than lists of interfaces when
creating mocks or stubs which provides the interfaces.
[jone]

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

- Patch mock_tool: do not count, so that it can be used multiple times.
[jone]

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

- Initial release