Adding Darwin Core support to Islandora Zip Importer

With some Drupal coding standard fix
No worries! Hopefully I didn't come off too scary in text :smile: 

I'll bug @dmoses about where this came from now, and if we have permission to distribute it. If so, I think we should be good to go once we get that last Drupal Coding Standard error taken care of. Looks like it is just a period at the end of a comment.