[Building Sakai] Resource item description

[Silverio, Gonzalo]

Hi

Was asked by the MT to request review of a patch that allows user to see on request the description of a Resource item. The patch is attached to:

	https://jira.sakaiproject.org/browse/SAK-19912

It essentially adds the resource description to the DOM but off the viewport, moves it into the viewport on a user click. Visibility for screen readers is managed via WAI-ARIA state changes, tabindex and focus manipulation. 

It needs to be noted that it diverges from solutions to the same issue proposed here:

	https://jira.sakaiproject.org/browse/SAK-10581

and used in several large installations for a long time. The differences are only in the way the description is revealed. In both cases the only potentially risky thing (having the description in the view at all) is common.

Please review and provide feedback. If no there are no objections by 05/02 I have been asked by the MT to commit this to trunk. 

Thanks!

	-Gonzalo