Fixed use of option "expose files".
Merge pull request #9 from Daniel-KM/expose_files

Fixed use of option "expose files".
Add RDF format supporting qualified DC elements.

This implementation (and the repository generally) could use some
further optimization.
Remove toolkit description from Identify.

Ref #8.
Get the true earliest date stamp.
Zendified plugin.
Added an option to change the url of the repository.
Added an option to avoid exposition of empty collections.
Fixed use of option "expose files".
Returned only public items.