Eke.biomarker

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* Made compatible with Plone 4.2.4.
* CA-1083 - eke.biomarker RDF ingest should treat predicate
"hasBiomarkerStudyDatas" as a resource-pointing predicate
* CA-1090 - For biomarkers, show a "-" or "N/A" or SOMETHING for prevalence,
NPV, and PPV if they're zero or not given.

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* Made compatible with Plone 4.1.5.
* CA-1010 - Show blank if values are 0 or 0.0

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This release includes:

* Depending on just Plone the framework instead of Plone the application.

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This release includes:

* CA-784: Add ability to associate eCAS datasets with Biomarker records in the
BMDB
* (No issue ID): Dataset links should go directly into eCAS

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This release makes functional tests more resilient.

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This release includes:

* A plone.app.testing layer.
* Support for edrnsite.collaborations
* Re-attaches biomarkers that indicate their collaborative group back to the
"Collaborative Group" (from edrnsite.collaborations) objects to which they
"belong".