Eke-knowledge

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This release includes:

* Depending on just Plone the framework instead of Plone the application.
* Updating to the plone.app.testing fixtures.

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This release includes:

* A plone.app.testing layer. It doesn't use it yet, though.

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This release updates the GenericSetup profile to 4, and provides upgrade steps
to that profile.

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It used to be you could call an Archetypes's DateTimeField mutator method with
a string like::

'2011-05-04T13:29:26.311Z'

However, the alleged "fix" to http://dev.plone.org/plone/ticket/10141 broke
that. This release works around that problem by chopping off milliseconds
(and UTC "zulu" indicator) before passing the string onto the mutator.

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This release makes eke.knowledge compatible with Plone 4.

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This release addresses the only issue below:

* CA-733 - Ingest of science data should treat custodian field as plain text,
not marked up HTML