#1952 Add bulk tagging to the Organize module.

Allow a user to highlight one or more items (images, videos, or albums), and enter a tag (or tags, comma delimited) and apply it to all of the selected items. The code is based on the batchtag module.

If the tags module is not enabled, no changes to the Organize UI will be shown.
Merge pull request #97 from mikeage/organize_tag2

Add batch tagging via the organize module