* Do not require the role extra from grokcore.security.
1.10
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* Use the component registration api from grokcore.component.
* Update how the static resources are found on a ``ViewletManager`` and a ``Viewlet``, following the new name ``__static_name__`` set by the template association.
1.9
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* Introduce the `available()` method on viewlet component. The viewlet manager will filter out unavailable viewlet by calling this method. The `available()` method is called *after* the viewlet's `update()` is called, but *before* the `render()` is called.
1.8
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* Update to use TemplateGrokker from grokcore.view to associate viewlet and viewletmanager templates.
1.7
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* The computed default value for the viewletmanager directive is now defined in the directiv itself, not as a separate function that needs to be passed along.
1.6
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* Upped version requirements for martian, grokcore.component, and grokcore.view.