Expose package_show API

See: http://docs.ckan.org/en/latest/api.html#ckan.logic.action.get.package_show

The id for this should be the uuid, not the alias.

This should also mirror rest/dataset/{id}

Steps:

• Create two custom menu items
• Create callbacks that call the dkan_dataset_resources_json view grabbing the nid for the uuid supplied as the argument
• Return "not found" if nid is not from a dataset
• Update the dkan_dataset_resources_json view so that it isn't a page anymore and is just a master display
• Check to verify that the output is compatible with the CKAN API
• Update dkan_sitewide block to reflect change from node/%/json endpoint to api/action/package_show?uuid=%