Plone.app.redirector

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- Fixed tests to use registry for value lookup.
[esteele]

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- Rerelease of 1.2.1 as 1.3 for clarity. This is for Plone 5 only.
[maurits]

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- Rerelease of same code as 1.2. The changes from 1.2.1 are for Plone 5.
[maurits]

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- Rename without using folder_contents.
[davisagli]

- Use p.a.contenttypes test fixture and adapt/fix failing tests due to the
ATContentTypes removal from PLONE_FIXTURE in Plone 5.
[timo]

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- Support redirecting to external URLs.
[rpatterson]

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- Import object events from zope.lifecycleevent.
[davisagli]

- Move tests from PloneTestCase to plone.app.testing.
[timo]